Memorable Overclocking-Friendly CPUs
Enthusiasts take been pushing the limits of silicon for equally long as microprocessors have existed. Early on overclocking endeavors involved soldering and replacing crystal clock oscillators, only that practice quickly evolved into changing system passenger vehicle speeds via motherboard DIP switches and jumpers.
Internal clock multipliers were introduced but it didn't accept long until those were locked down equally unscrupulous sellers removed official frequency ratings and applied their own faster markings. Arrangement buses and dividers became key for most, while the ultra-enthusiast would physically change electrical specifications through difficult modding.
The present mural harks back to the advent of internal clock multipliers. System double-decker speeds have become increasingly regulated to maintain system stability, which has once more leveled the playing field for the competitive nature of overclocking.
These are simply a few of the landmark processors revered for their overclocking prowess. Read on!
Note: This characteristic was originally published on December 2022. We have bumped it considering CPU overclocking is equally cool today as it's been since the i286 days. Office of our annual #ThrowbackThursday initiative.
Intel Pentium MMX 166
The Pentium MMX arrived amongst the elevation of retailer shadiness and x86 processor vendors responded by locking upper limits for multipliers. As such, many MMXs relied on bus frequency increases for overclocking. Unlocked MMX processors offered more than options for overclockers and the unlocked MXX 233 reigned supreme, though its $594 price was prohibitive for many.
At $407, the MMX 166 was a better value, and when paired with a solid 430TX-based motherboard that had a omnibus speed of 75MHz out of the box, 225 or 266MHz (3 or iii.5 multi) was inside reach. To crack 200MHz, MMX 166s with a locked multiplier would need to use the 83MHz jumper setting if bachelor (ii.five * 83 for 207MHz), although stability and heat build-up at this bus speed were far more problematic, as was the sourcing of quality EDO/SDRAM RAM required to run at this frequency.
Intel 486DX2-40
The P24 DX2 486 processors introduced the CPU clock multiplier, doubling the system bus speed, while the organization passenger vehicle frequency itself was configurable via motherboard jumpers or DIP switches. Initially including 20, 25 and 33MHz options (later augmented by 40 and 50MHz models), users had a path to overclocking that didn't require soldering and replacing the clock crystal oscillator.
Alternatively, you could get the operation of a $799 DX2-66 by purchasing the more modestly priced 486DX2-40 for $400 and raising its default bus speed from 20MHz to 33MHz.
Stability and VLB slot issues at bus speeds over 33MHz meant that overclocking headroom decreased as the base clock rose -- to the extent that many Intel DX2-66s wouldn't overclock at all and the few that did were often limited to 80MHz (2 x 40MHz).
Intel Celeron 300A
Recollect legendary. The Celeron 300A was largely responsible for reigniting mainstream processor overclocking in the belatedly xc's through the ease that it could be accomplished. A 50% overclock to 450MHz was every bit simple as irresolute the bus speed from its nominal 66MHz to 100MHz. Although some boards topped out at 83.3MHz limiting the OC to 375MHz, motherboards that supported 103MHz FSB could yield 464MHz.
A better chip with a voltage bump could run at the 112MHz FSB setting to produce 504MHz. Remarkably, the 300A could generally reach 450MHz without any additional voltage requirement over the nominal ii.0 volts. The chip'due south operation was also aided by having an on-die L2 cache and with a price of $149 it was particularly accessible to system builders.
AMD Athlon 700 (Thunderbird) / Duron 600 (Spitfire)
AMD's Thunderbird pencil modernistic was an overclocker'southward dream. AMD locked the voltage and multipliers of its K7 line in an effort to curtail the fraudulent remarking of processors to higher specifications. Overclockers speedily realized that the circuit bridges built into the silicon package held the key to unlocking performance.
Initially, a combination of connecting bridges in the L3, L4, and L6 blocks gave way to the bridging of L1 connections to unlock the multiplier. Bridging L7 connections to modify core voltage was as well an option and the process could exist as easy as using a soft lead pencil or conductive silver pen.
With AMD's EV6 system charabanc being sensitive to overclocking, multiplier overclocking provided results with the Duron leading the way thanks to its lower base of operations cadre voltage (1.5v versus 1.7 /1.75v), which enabled college relative overhead to the maximum one.85v allowed.
For $112 and a footling time, the Duron 600 easily approximated the functioning of a processor many times its price.
Intel Cadre two Quad Q6600 G0 Revision
The Core 2 Quad Q6600 achieved an enviable record of longevity and performance value, condign the de-facto option for overclockers who wanted a upkeep quad-cadre CPU. Once the processor dropped in cost from the initial $851 in Jan 2007, information technology quickly fell to $530 in May and farther pricing realignment in July coincided with the arrival of the G0 revision. At $266, the 2.4GHz quad-core scrap was priced identically to the new dual-cadre 3GHz E6850, a frequency that the earlier B3 revision Q6600 could comfortably eclipse.
The new G0 stepping offered slightly lower power consumption, which translated into the same improvement in overclocking ability, resulting in many users being able to sustain three.iv to 3.6GHz fairly readily. The introduction of the affordable Intel P35 platform and further Q6600 cost cut through 2008 to $224 (Apr) and downwards to $183 (Oct) provided the opportunity for solid overclocking in the l% range (9x multiplier 10 400MHz FSB for 3.6GHz) on a moderate budget that remained very competitive long after many of its contemporaries had faded.
Intel Pentium Three 500E
The Coppermine Pentium III 500E and 550E'south overclockability prevarication in conservative binning, a low 100MHz Front Side Coach and the processor's integrated L2 cache. Upkeep pricing ($239) and the possibility of using older Slot 1 motherboards via Socket 370 to Slot i adapters enabled premium functioning for a modest outlay.
The 500E could easily be run at 667MHz by selecting the motherboard'due south 133MHz FSB BIOS pick or by using tape or lacquer to isolate the Slocket's A14 pin, while 750MHz (150 FSB) and higher were possible on better boards, producing operation equivalent to the $850 Pentium III 800.
However, there were some caveats to overclocking, including that motherboards needed to support AGP and PCI clock dividers (1:2 and 1:4 respectively) to maintain stability for attached components and fast PC133 RAM.
AMD Athlon XP-Thou 2500+ (Barton Mainstream 45W TDP)
In early 2004 it came to the attention of the overclocking community that the mobile Barton processors featured an unlocked clock multiplier in add-on to beingness binned for low-voltage functioning (1.45v compared with the desktop 1.65v). These factors often produced phenomenal overclocking headroom -- something lacking in the desktop models.
When the bit'south overclocking potential was publicized, such was the stampede that its price escalated over xxx% from the $75 MSRP in a matter of weeks. With a solid nForce2 motherboard, decent cooling and a willingness to push the voltage to 1.8v and college, a 30 to 40% overclock was often accessible. While the impressive speed crash-land couldn't span the performance gap to the new Athlon 64s, the Athlon XP-G 2500+ didn't cost $200 to $400 either.
AMD Opteron 144 / 146 (K8 Venus)
Featuring the aforementioned silicon as AMD'south San Diego-based Athlon 64 processors, the $125 and $183 Socket 939 Opterons enjoyed a pregnant pricing advantage over the similarly featured Athlon 64 3700+ at $329 and stacked upwards fifty-fifty meliorate confronting the $ane,000 FX-57.
Like all upwardly locked multiplier processors, the Opteron's power was tied straight to the strength of the motherboard being used. Conservative binning of the Opteron server fries allied with a solid overclocking lath such every bit those sporting the nForce4 chipset with HyperTransport frequencies approaching (and exceeding) 300MT/sec would lead to overclocks seldom seen with enterprise-form processors.
With all the Opteron models having roughly the aforementioned overclock ceiling, the lowest priced 144 sold out apace in many markets.
Intel Cadre i7 2600K / Core i5 2500K
When Intel appear an upper clock multiplier limit and almost not-existent system bus overclocking for its upcoming Sandy Bridge compatible Cougar Point chipsets, it was widely touted as the end of overclocking on Intel platforms. The truth turned out to exist that the 2500K and 2600K were premier overclockers requiring minimal endeavour in fourth dimension and cooling for stable overclocks in the 30 to fifty% range.
Such was the popularity of the 2600K that submissions from this processor deemed for around 28% of all CPU results to HWBot in 2022 and would exceed those of its successor, the 3770K, in 2022. A low toll of $216 plus solid cooling results when paired with either air or water made Intel's 2500K the de facto standard by which all other consumer CPUs were judged.
Intel Core i7 920
The new Nehalem compages and X58 platform offered enough hope to coax many users from long-lived Core 2 LGA 775 systems. While the flagship i7 965 EE at $1,000 was cheaper than the Cadre 2 QX9770 past a 3rd, it notwithstanding represented little in the way of value compared to the i7 920.
Initial C0 revision Bloomfield CPUs earned a reputation for loftier voltage requirements past iii.6GHz, the following D0 often had the ability to maintain the nominal 1.26v up to 4GHz and an absolute overclock ceiling approaching 4.5GHz for those tempted to plough the voltage closer to one.5v.
Such was (and is) the 920's popularity that information technology represents over a tertiary of HWBot'due south overclocking submissions for 64 LGA 1366 processors.
Intel Pentium 4 1.6A / Celeron ii.0 (Northwood)
The inflow of the Northwood cadre was a welcomed sight after the disappointing Williamette, whose voltage and resulting heat stifled serious overclocking for the mainstream. While the higher-clocked P4s offered little if any value against the Athlon XP, the i.6A at $125 turned a operation deficit into a win with its low base FSB of 100MHz which could easily exist increased to 150 for a 2.4GHz clock speed.
The Celeron's overclock was higher still thanks to a 20x multiplier, although functioning was heavily constrained past the meager 128KB L2 enshroud. Those seeking college overclocks would need to button the core voltage past one.6v either through BIOS settings or the wire modern (connecting CPU pins to raise Vcore limits), the latter being largely responsible for the phenomena of Due south.N.D.S. (Sudden Northwood Death Syndrome), more than normally known every bit electromigration.
This cistron and the 1.6A cannibalizing Intel's own higher priced models are seen as the motivation for the company to cease sales of the 1.6A barely six months afterwards its introduction in January 2002.
Intel Xeon LV 1.6 D1 revision (Prestonia)
Overclocking is most often associated with gaming systems, but dual-processor overclocking has maintained a solid following for over a decade. Long before the QX9775 and Intel'south Skulltrail board became the watchwords for performance excess, many enthusiasts sought the budget Xeon LV i.vi.
The Prestonia core was basically the Pentium 4 Northwood with SMP (symmetric multiprocessing) and HyperThreading added as standard features. With the sub-$200 ane.6GHz Xeon drawing a frugal one.274v, overclockers generally couldn't take advantage of voltage headroom as nearly boards were voltage-locked. However, just raising the FSB would net 2.6GHz.
For the more adventurous, 3 hard mods could yield a 100% overclock (or more than!): the U-Wire modernistic which involved bridging two (ane.5v) or three (1.6v) sets of socket pins, the BSEL modern to isolate or break CPU pins and raise the FSB limit to 200MHz, and the vDIMM mod to raise RAM voltage.
Those willing to button the limits of the applied science could be rewarded with a 3.2GHz dual processor performance king for around $700 (CPUs, coolers, board, and RAM).
AMD Athlon XP 1700+ (Thoroughbred-B)
The initial Thoroughbred-A was little more than a die shrink of the previous Palomino and was somewhat disappointing as a final production. The June 2002 introduction of AMD's Thoroughbred-B was more than tuned for the 130nm process and resulted in higher core frequencies forth with existence more efficient as the 'B' revision demonstrated a remarkable overclock ability with minimal if any voltage increases.
Allied with a strong nForce2 chipset motherboard, the $60 XP 1700+ was fully capable of near 2GHz core speed at its default voltage. With an nF2 board capable of pushing the arrangement bus past 200MHz, information technology was possible to sustain a forty% overclock with a pocket-sized 1.7v, eclipsing the functioning of AMD's $397 Athlon XP 2800+ flagship and putting Intel's Pentium iv on observe.
Intel Pentium D 820 / D 805
The Pentium D 820 was something of an anomaly with two single cores on an MCM package for much cheaper than the cheapest dual-core AMD Athlon 64 X2 at $241 and even undercut the unmarried cadre Athlon 64 3500+ past $30. The Pentium D 820 offered modest performance in no way challenging the Athlon dual, but some considerable overclocking headroom with judicious voltage and a skilful air or water-cooling system.
The arrival of Intel's $129 D 805 further endeared the hot Netburst processor to the upkeep overclocker. A reduction in nominal system bus speed from 200MHz to 133 was offset past the D 805's 20x clock multiplier, resulting in no reduction in overclocking fun. For those of pocket-sized means, a D 805 paired with a solid 945P lath and value-orientated RAM held the promise of performance that was the province of a $500 processor-dictated build.
Intel Pentium Dual Core E2140 / E2160
Intel'southward E2000 series effectively signaled the terminate of both the final surviving NetBurst Pentium D and AMD's dominance in the budget market place. Intel would halve the L2 cache of the E4000 series and further hobble performance with a 200MHz (800 FSB) system bus. What Intel didn't do was remove the Conroe processor's power to overclock.
Yous could hit a 50% overclock with default voltages and the stock cooler by simply raising the bus speed to 300MHz on either an affordable Intel-based P965/P35 board or one with an Nvidia 650i SLI chipset which allowed greater options with cheaper RAM thanks to its non-reliance on memory dividers.
An aftermarket air libation, voltage adjustment and some luck in the silicon lottery could come across the processors at or almost a 100% overclock, delivering functioning around the level of the E6700 for a fraction of the cost.
AMD Phenom 2 X2 550 Black Edition (Callisto) / X4 955 Blackness Edition (Deneb)
The release of AMD's revised K10.5 architecture during the early months of 2009 marked a resurgence of the company's strong value proposition. The emergence of the Black Edition processors also added the welcome addition of the unlocked multiplier to facilitate overclocking.
While the eventual clock speed increases weren't excessive by historical standards, they did become mitt in hand with actual operation gains which comfortably lifted them out of the Cadre 2 Quad shadow. At $100, the 550 Black Edition represented a superlative value if the two disabled cores could be unlocked (the unlocking of the fourth core would be a major selling point for the X3 720 Be), while the outright functioning of the $245 955 BE ensured that only Intel'southward more than expensive X58 platform exceeded its potential.
Intel Core 2 Duo E6600 (Conroe)
When Intel'southward Conroe architecture arrived in July 2006, most of the attention was focused on the unlocked multiplier X6800, only it was the cheapest fully enabled (4MB L2 cache) chip that stole the show. For $316, the flake cost a full $200 less than the next step up in performance (the E6700) and already provided results that rivaled AMD's top Athlon 64s.
With stock cooling and default voltages, you could generally rely on the E6600 to striking two.7 to 3GHz. If y'all had an aftermarket cooler, motherboard stability was often the limiting cistron as arrangement bus speeds flew past 400MHz and edged towards 450. Such was the overclocking potential that the $999 X6800 and $799 Athlon 64 FX-62 looked positively ludicrous when comparing price and performance with the E6600.
Intel Core 2 Duo E8400 E0 Revision (Wolfdale-6M)
The initial January 2008 C0 revision Wolfdale-based E8400 had immediately ensconced itself as an affordable performance overclocking processor. Five months subsequently, the E0 revision brought a much refined voltage requirement. While some C0-step E8400s were capable performers at the 4GHz level, more often than not, the same frequency could be achieved with stock voltage, settings, and cooler with the new revision.
By the time the E0 arrived, pricing had fallen to $149 for the OEM bundle with a range of very capable P45 and X48 boards able to maintain bus speeds in the vicinity of 500MHz (2000MHz FSB). The continued stability of these 4+GHz systems many years afterwards is a testament to the quality of both the architecture and the chipsets.
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Source: https://www.techspot.com/article/922-memorable-overclocking-friendly-cpus/
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