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Fx 8350 Trying to get best performance per core - Page 5

post #41 of 45
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Quote:
Originally Posted by nX3NTY View Post

Final test. Weird how it get higher maximum framerate at 4GHz. Average framerate is less than 1fps anyway so it's irrelevant, at least in Metro 2033


Something is screwy there. You should be getting better max framerate at a faster speed then at slower for 4M/8T. Did you disable turbocore for the 4M/8T 4ghz test?
post #42 of 45
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Quote:
Originally Posted by nX3NTY View Post

Final test. Weird how it get higher maximum framerate at 4GHz. Average framerate is less than 1fps anyway so it's irrelevant, at least in Metro 2033


I appreciate your time doing benchmarks.
post #43 of 45
Yup, everything is the same for all. Same GPU clock, same memory timing, same HTT and HT speed, same NB speed. Only the multiplier and voltage is changed. Turbo is always disabled, APM is also disabled. CnQ is enabled though because I don't like it to run at full speed all the time. But I checked there is no thermal throttling. Weird result. I got some other games where AMD saw big performance hit like Serious Sam 3 but it didn't have build in benchmark like Metro 2033 did
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post #44 of 45
Quote:
Originally Posted by Timeofdoom View Post

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?)

Run this test once more, but with all cores active in bios and then run a custom cinebench with only 4 threads. You will get almost the same score, in my case, it is slightly lower when disabling cores.

Also to reiterate my first point; that isn't a single threaded calculation you are getting by dividing your scores by how many cores you have active. Run a single threaded cinebench run and you will get near, if not the same single threaded score using 1c/1m and having all cores activated. It will then give you a scaling calculation as to how well the cores actually scale... 1c/1m scales very well (3.9ish/4), all cores activated should be around 6.9/8---> this is a guess as I can't remember the exact number I got.

My point is that by disabling the cores you don't gain anything. You will get the same score if you just leave them active. If a program only uses 4 threads, you will get the same performance with all your cores activated in the bios as you would going 1c/1m. Also, in my experience there is really no added overclocking headroom from disabling cores. So again, really no sense in disabling cores.
Edited by Ultracarpet - 3/7/14 at 10:33pm
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