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Fx 8350 Trying to get best performance per core - Page 2

post #11 of 45
You Will be better with 8cores@4.5ghz than 6cores at 5.2ghz.

Piledriver has a weak IPC you need the higher quantity of cores with them because is not that the games uses 4 cores.it`s that you need more cores to share the load in a weak architecture
post #12 of 45
Yea my motherboard (a relatively new AM3+ board) also has the option to run 1 core-per-module. I happen to agree with the philosophy that if the workload that one is trying to optimize performance for *never* exceed more than 4 threads, then you will get more performance from a higher clocked core-docked configuration. Very likely the machine could run the same overclock without disabling the cores, but could get into thermal trouble if an unexpected workload [or one that the user does not care to optimize] were to saturate more than 4 cores for more than a few seconds (like a hanging program or a virus/gunkware etc). Provided all of the anticipated and intended workloads (not the unanticipated or inconsequential or accidental ones) are in fact lightly threaded, and disabling cores affords the opportunity to achieve higher clocks, then performance in the workloads that "count" for that user will be better with disabled cores and higher clocks.

More cores can not makeup for the weak architecture unless the workload is parallel enough to take advantage of them, and most workloads simply aren't, which is why we see i3-4130's beating FX-8350s in *many* real-world benchmarks. In fact, the greatest argument against an AMD rig at this time, is the mediocre performance in lightly threaded workloads, which so many workloads still are.


This thread has given me one more check-mark in the "I love linux" column. I can adjust core count on every boot and never have a problem, lol.
Edited by mdocod - 2/23/14 at 11:15am
     
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post #13 of 45
Well, I ran cinebench when i had the 1 compute unit per module and it netted me 4.6 score, so 4,6/4 = 1.15.
I ran it Again with all cores enabled and I got 7.68/8= 0,96; so the trick still holds very true (1,15/0,96=~1,20 or 20 %).
I wish AMD would fix the FPU problem and give us another 8-core, even if on a new socket. (8x1,15=9,2)
But that's probably a pipedream - which reminds me: did Kaveri really fix the FPU problem?)
    
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post #14 of 45
Thread Starter 
Sweet now I just need to find out how to just get one core per module on my asus crosshair formula z.
post #15 of 45
Thread Starter 
This is what i see when i try to disable each core individually. It doesn't make scene though because the description is worded to sound like you can disable any cores you want in any order. There must be some want to change this but i cant figure it out.
post #16 of 45
Can you send a screenshot of all the advanced options? Since that's only for the pairs of modules.
    
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post #17 of 45
I've seen benches were 6 core processors outdo 4 core ones in Crysis 3.I don't think just because most games recommend only 4 cores that they can use only 4.
    
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post #18 of 45
Quote:
Originally Posted by Timeofdoom View Post

Can you send a screenshot of all the advanced options? Since that's only for the pairs of modules.
I have the Sabertooth 990FX R2.0 and it has basically the same BIOS. As far as I know, you can only disable cores in pairs, with the exception of an option to leave only the first core running.
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post #19 of 45
Quote:
Originally Posted by Jaydev16 View Post

I've seen benches were 6 core processors outdo 4 core ones in Crysis 3.I don't think just because most games recommend only 4 cores that they can use only 4.

It's not about what the game recommends, it's about how many threads the game engine can actually spawn and whether or not spreading them to more than 4 cores has any impact on performance. Often, the FX-6300 and FX-8320 will outperform the FX-4300 in games that "technically" only use 3-4 cores, because these are module based chips, and as such, when the load is spread across 3-4 modules (instead of 2 modules) the CMT scaling losses are mitigated.

The performance improvement in that case is not because the game is magically using more cores, it is because the architecture has shared resources, and gives the highest per-thread performance when limited to 1 thread per core module. When core-docking a pile-driver in order to achieve higher clocks, it really only "makes sense" to bother if you can disable 1 core per module, otherwise the gains from increased clock speed are likely to be lost to CMT scaling losses.
Edited by mdocod - 3/7/14 at 9:44pm
     
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post #20 of 45
^^
Wow didn't know that!Thanks man!
    
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