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post #1471 of 8112
Thread Starter 
Quote:
Originally Posted by jprovido View Post

it actually does. if HT doesn't disable on lightly threaded then you'd have very poor performance(only half performance). it's not perfect though that's why some games perform less with HT enabled
we're getting side tracked. the point I was trying to make is calling bulldozer an 8 core cpu IS correct. it's not only false marketing. you can't call it a 4 core/8 thread cpu because the architecture doesn't work that way

it still has 8 cores....

there is nothing wrong with calling it an 8 core processor.

Long ago we learned that more cores != more performance.
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post #1472 of 8112
like what I said HT is not perfect. we all knew that and bulldozer's approach was better. even with the scheduling problem fixed bulldozer's real problem is poor IPC. if amd just needs to fix this along with the scheduler to save their cpu department
post #1473 of 8112
Quote:
Originally Posted by reflex99 View Post

it still has 8 cores....
there is nothing wrong with calling it an 8 core processor.
Long ago we learned that more cores != more performance.

I think you're not reading my post clearly. that's the point I was actually trying to make lmao. fx8150 IS an 8 core processor. not a false marketing move that someone just said in the thread tongue.gif
post #1474 of 8112
Congrats on the 8150, You should be able to hit 4.2ghz on air easily. 4.4 shouldnt be out of the question, and 4.6 should be attainable if your cooler can keep your chip below ~58c. Try not to get load temps above 60c. Temps should be measured with Core-Temp. If your lucky, you might get 4.8+ with a decent sealed water cooling kit, or custom loop.

Im not sure how everyone else is doing there oc's on FX chips, but I got mine through changing the multipliers up on CPU and CPU-NB. I know some are starting with a multiplier OC and bumping the bus to get every last mhz out of the chip.


@ jprovido:
I agree, were getting a bit OT. but Ill squeeze this last bit in.

Any Intel CPU with HT has duplicated registers for each cpu. Intel took this route due to its low transistor overhead, and possibly good results for some people. This takes about 2-4% extra die space or so per core. This is SMT

AMD duplicates only the integer pipelines and their schedulers, because it provides a more reliable boost to performance than shoving two threads of instructions down a pipe. This takes 15% extra die space per core. This is CMT.

The logic behind AMD's approach is that with more execution resources you achieve a more tangible benefit under a wider array of workloads. They both operate nearly identically except AMD traded die space for a more reliable boost in performance.

HT doesnt auto-disable wink.gif , if windows fires off a thread at CPU-1 for some odd reason CPU-0 performance is impacted same as CMT. I think the 10% hit with CMT on is due to most benches trying to eat all available CPU cores, or windows not knowing that it shouldnt schedule on cores sequentially.

Another legitimate problem is that it doesnt look like the FPU in BD can properly do dual independent 128b issues on the same clock cycle for each active thread. This is something that was expected but seemingly didnt show up to the party. IMHO this could have drastically improved performance if my understanding of how the current chips work is right. (FPU only accepting one 128b issue per cycle)

This is relevant to the thread I suppose, as its constructive BD related discussion.
Edited by KarathKasun - 11/21/11 at 12:35am
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post #1475 of 8112
^
just want to add this as well. with CMT at 100% load the resources that are shared becomes a bottleneck as well imo. the reason why when a 4 module only has 1 core activated for every module it has better clock for clock performance

the bottom line is amd had a better approach with CMT especially with multithreaded apps. I was expecting bulldozer to be decent in single threadded apps and to be epic at heavy workloads but this did not happen. like what I said before I'm not blaming the architecture but the production process. in short. GloFo *****d up tongue.gif
Edited by jprovido - 11/21/11 at 12:30am
post #1476 of 8112
Indeed, I think it was rushed out a bit due to SB-e's coming out.

If AMD can release a 4.6Ghz stock clocked FX-4 chip with 5% boost to FPU IPC, they will definitely get a good hold on the lower end performance bracket. And a FX-8 chip @ 4.2-4.4 with the same fixes would give them a chunk of the upper mid-range. I'm not even sure how large of a difference a true dual issue FPU would make, seeing as most info about that is hearsay at the moment. It could possibly boost FP throughput on older code by 100%. (I'm being totally optimistic about that, It would likely be more along the lines of 30-50% due to instruction decode limitations, and the fact that most FP operations are not single cycle.)
Edited by KarathKasun - 11/21/11 at 12:50am
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post #1477 of 8112
Thread Starter 
very constructive talk here guys

well done

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post #1478 of 8112
Quote:
Originally Posted by darthjoe229 View Post

Hey guys finally got the 8150 installed and running, I'll post a CPU Z later (currently burn testing).
I'm currently 240x18.0 with a 1.34 cpu voltage. I haven't really had OCable CPUs before, so I was wondering if this is good, if I should push for more, or try backing things down. Just got a reading at about 36 GFlops 213 seconds in. I don't have a whole lot of time to devote to this, so if you guys could gimme an idea where to start it would be very helpful biggrin.gif
Running a megahalems rev1 with a single ultra kaze full speed on pull. Thanks guys!

I just want to make sure I have this straight.. @ 4320mhz and 8 cores, you're getting 36 GFlops? On Intel Burn Test.. or? If it is IBT I'm going to go out on a limb and say you're unstable..

Edited: Got to thinking, IBT probably isn't using the integer cores, eh?
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post #1479 of 8112
Thread Starter 
well, since FLOPS stands for Floating Point Operations per Second

I would think it does use some floating point math.
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post #1480 of 8112
Ive noticed that to actually get stress test stable you have to give the CPU a fair amount of volts. Most review sites benched with high clocks w/o stress testing or turning off APM which gives false oc results due to severe core throttling. We should probably do tests on some of our tweaked systems, or compile the results in the thread.

Its a possibility that Im wrong on the reviews, but Ive seen one with an addendum where performance went up ALOT with a bios update.
Edited by KarathKasun - 11/21/11 at 1:18am
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