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4GHZ Thuban Bottleneck? - Page 6

post #51 of 146
Just ran Unigine Heaven bench, once with my CPU running with only two cores enabled and a second time as a six core. The settings for both were:
CPU: 4.2GHz and 3GHz CPU-NB
GPU's: 5870 stock, 5850 900:1200 to match the 5870 better.

These are the scores:
As a dual core:


As a Six core:


Almost twice the FPS gained.
post #52 of 146
well, did you take my advice to overclock the NB? only CPU ocing is not going anywhere, the real improvements comes from ocing the NB from 2000 to 2600-2800.

this will increase ingame FPS quite a bit, about 5-10 FPS, games may vary.

edit: NVM, you got it on 3000, very nice, what voltage did it take?
     
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post #53 of 146
Quote:
Originally Posted by ChronoBodi View Post
well, did you take my advice to overclock the NB? only CPU ocing is not going anywhere, the real improvements comes from ocing the NB from 2000 to 2600-2800.

this will increase ingame FPS quite a bit, about 5-10 FPS, games may vary.

edit: NVM, you got it on 3000, very nice, what voltage did it take?
I'm not the OP with the issue but I'm running 1.475v currently just to ensure stability, this chip will do 3.4GHz on the CPU-NB. I've been overclocking the CPU-NB since the first Phenom II's came out.
post #54 of 146
So Heaven uses more than 2 cores?

Boy you sure told me!


Edit: Btw before that can be even considered proof that Heaven uses more than 2 cores (which is a dumb point to make) you'd need to show more than just the results.
Edited by BallaTheFeared - 5/2/11 at 4:12pm
    
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post #55 of 146
all phenom ii users have to know that it ain't just the CPU OC alone, the NB has to be OCed as well to get maximum performance.
     
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post #56 of 146
Quote:
Originally Posted by BallaTheFeared View Post
This is incorrect.

Using all the cores doesn't mean its using all the cores.

Before you hurt yourself, let me explain.

A game/program can only use as many threads as its programed to do. For many games this is two threads.

When a dual threaded game runs on a dual core system and the cpu is bottlenecking you will clearly see it as 100% gpu usage.

Now lets assume you have an x3, that same game bottlenecked would show 66% cpu usage. While the cores would not be maxed out, because of Windows thread shuffling the added core does no provide any increase in performance outside of those gains by background tasks having an additional core to use.

Next we'll look at that same game on a x4 cpu. This time around the cpu is still bottlenecking because the game while provided with more cores is still only capable of using 2 threads (cores). Instead of the cpu reading 100% or 66% while bottlenecking, in this case the CPU will read 50%. However you can rest assured, 100%, 66%, 50%, it doesn't matter. The performance is exactly the same.

Now we've arrived at the x6. Using the same game as reference the Phenom II 1090T is bottlenecking same as the 965, same as the 555. However the cpu usage when only 2 threads (cores) are used and are maxed out will only reach about 33%. Its the same bottleneck, with the same performance. The added cores do not improve the performance of the game.

To figure that out yourself, 100% on 6 cores is roughly 16.67% cpu usage per 100% usage core.



Now on to Windows spreading a single thread over multiple cores and why its not the same as all cores being used.

For this demonstration we'll use Super Pi. Super Pi is a single threaded benchmark tool. It doesn't matter if you have 1 core or a 48 core server setup, it will only use 1 thread (1 core). However if you run Super Pi with out changing its core affinity Windows will spread that one thread over all available cores. That means if you have an AMD 1090T and 6 cores while running Super Pi you will see activity on all 6 cores most likely (about 12.67% total cpu load), however your performance will be exactly the same if you set the affinity of the program just use 1 core. If you set it to just use 1 core the total cpu usage would still be 12.67%, however one core would be pegged at 100% this time instead of the same thread being spread over multiple cores.



What does this all mean? It means you clearly do not understand what it is I'm talking about, but there is a chance you may now. It means the OP doesn't need to have one or two cores at 100% usage, nor does he need all six cores to read 100% usage for there to be a cpu bottleneck.


I hope this helps.
What this means is that the actual bottleneck is the game because it only allows 2 threads instead of the 6 that are available.

@OP what do you mean FPS is "all over the place"? That really doesn't mean anything to me, because I have games that range from 50-90fps depending on the current gameplay. Totally all over the place, can my eyes tell a difference? No.
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post #57 of 146
No I'm saying if you had faster per core performance you'd get better results.
    
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post #58 of 146
Quote:
Originally Posted by BallaTheFeared View Post
No I'm saying if you had faster per core performance you'd get better results.
It's been known for quite some time that Intel wins in 'per core performance'. That can be seen with SuperPi results from generations of processors in the past. That doesn't make the processor the bottleneck though, it makes the game design the bottleneck.

Challenge me to a run with wPrime. I bet I beat your 2500k that runs a whole 1GHz faster 'per core'.
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post #59 of 146
Games aren't the bottleneck, your hardware is.

Games don't magically use 6 cores because AMD made one.

What would the point of that be?

My i5-2500k is faster than your 1090T, even when all cores are used.

I don't need wPrime to prove your system is slower even when maxed out.
    
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post #60 of 146
Quote:
Originally Posted by BallaTheFeared View Post
Games aren't the bottleneck, your hardware is.

Games don't magically use 6 cores because AMD made one.
Games should be engineered to take full advantage of the hardware they use, not the other way around.

Quote:
Originally Posted by BallaTheFeared View Post
My i5-2500k is faster than your 1090T, even when all cores are used.

I don't need wPrime to prove your system is slower even when maxed out.
Then beat it.

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