Bulldozer Breaks Frequency Record Again: Overclocked to 8.46GHz
by Kristian Vättö on October 29, 2011 11:24 AM ESTJust before the launch of Bulldozer, AMD demonstrated it at 8.43GHz, which was the world record back then. Now an overclocker named Andre Yang has achieved an overclock of 8.46GHz, beating AMD's record by ~30MHz.
Above are the CPU-Z screenshots of the new and former record. The exact frequency is 8461.51MHz, which is 32.13MHz faster than the previous record. As shown in the pictures, both CPUs had only two cores enabled and ASUS's Crosshair V Formula motherboard was used. Andre applied a core voltage of 1.992V, whereas AMD had a voltage of 2.016V in their setup. Cooling method of Andre's setup is unknown, but most likely either liquid nitrogen or helium was used.
Source: CPU-Z Validation Database
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biassj - Saturday, October 29, 2011 - link
Still can't beat an I5 single threaded. AMD fan here =(::zondas30 - Saturday, October 29, 2011 - link
oh this time its not only 1 vore left alive from 8 cores but 2 cores :D what a record, try it with all 8 cores to prove that amd is truly oc worth cpuKristian Vättö - Saturday, October 29, 2011 - link
Each Bulldozer module consists of two cores, so two cores is most likely the minimum you can use.Shining Arcanine - Saturday, October 29, 2011 - link
It is 1 core. These so called modules are AMD marketing terminology for actual cores. The two logical cores are from AMD's SMT implementation. Unfortunately, it does not seem like it is possible to turn that off to get 1 logical core.SlyNine - Saturday, October 29, 2011 - link
That is a grossly misinterpretation of the truth. Each module still has 2 integer cores and many components are doubled. It is DEF not SMT, Sure the FPU is shared but even then its a 4 FPU core CPU. No excuse for benchmarks below a Phenom core per core.silverblue - Saturday, October 29, 2011 - link
CMT for integer workloads, SMT for floating point.dgingeri - Saturday, October 29, 2011 - link
"CMT" Like Country Music Television?Sorry, SMT is Symetric Multi Threading, useful for integer or FP multithreading.
A single Bulldozer module will fully multithread integer caluclations and up to 128 bit SIMD (Single Instruction, Multiple Data) and FP instructions. (Standard FP calculations are 64 or 80 bit.) The only point where it will only handle one thread per module is 256 bit SIMD instructions. The big downside is that the x86 instruction converter/scheduler only handles 4 instructions per clock. That's primarily holding back the BD performance. If they could get that up to 8, it would match the current Phenom II architecture. If they could get it up to 12 and shorten the execution pipeline, I bet it might even match SB.
Never heard of CMT other than the cable channel.
silverblue - Saturday, October 29, 2011 - link
CMT = cluster multi-threading.rns.sr71 - Saturday, October 29, 2011 - link
conroe, wolfdale, nehalem and sandy bridge all decode a max of 4 instructions per clock, per core. nehalem and SB share that between two threads per core.K-8, K-10 and K-10.5 can decode 3 instrctions per clock, per core. no sharing.
buldozer decodes 4 instructions per module shared between 2 integer cores. it doesn't need an 8 wide decoder- it would be HUGE! bulldozer also has the same pipline length(roughly) as nehalem/SB. so thats fine.
the issue is in the cache speed/latency, OoO buffers(too small compared to nehalem and SB) and i would surmise the the 'fusion ops' isn't as good as what intel implements- thats huge.
a 3rd alu added per integer core would help, though. but thats going to increase the size, too and create executions resources that would go unused in some instances.
silverblue is right- 'cluster multi-threading'. sun micro-systems(now oracle) used it on the sparc and ultra-sparc processors.
JKflipflop98 - Monday, October 31, 2011 - link
So that means Intel 990X chips have 12 cores then? Because i7's have the same stuff.