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965 -> 8350 for server-type work - Page 2

post #11 of 18
Quote:
Originally Posted by Kolmain View Post

To my knowledge it is a true 8-core processor... I'll have to read up on it some more but it should be a pretty big improvement from your 965. It'll beat it clock for clock alone so more processors, more power? thumb.gif

A "true" 8 core traditional processor would have 1 FPU per integer core. With BD/PD this is not the case. There is a FPU for every 2 integer cores, so in the 8320 for example it has 4 FPU's like a normal quad core, and then 8 integer cores(2 per FPU).

FPU = Floating Point Unit.
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post #12 of 18
Thread Starter 
Quote:
Originally Posted by iinversion View Post

A "true" 8 core traditional processor would have 1 FPU per integer core. With BD/PD this is not the case. There is a FPU for every 2 integer cores, so in the 8320 for example it has 4 FPU's like a normal quad core, and then 8 integer cores(2 per FPU).
FPU = Floating Point Unit.

Is this a serious disadvantage for programs that require maximum double precision FLOPS?
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post #13 of 18
Quote:
Originally Posted by Killhouse View Post

Is this a serious disadvantage for programs that require maximum double precision FLOPS?

It would be a serious disadvantage if you were comparing it to a true 8 core with 1 FPU per integer core. This is not the case with you though since you are comparing it to a X4 Phenom II. IPC is about the same between Phenom II/PD and you'll have 50% more integer cores but the same amount of FPU's. PD is clocked higher by default and can reach higher frequencies as well.

It should definitely be an upgrade to what you do, but I personally don't think you'll get a 50% performance boost.
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post #14 of 18
Thread Starter 
Quote:
Originally Posted by iinversion View Post

It would be a serious disadvantage if you were comparing it to a true 8 core with 1 FPU per integer core. This is not the case with you though since you are comparing it to a X4 Phenom II. IPC is about the same between Phenom II/PD and you'll have 50% more integer cores but the same amount of FPU's. PD is clocked higher by default and can reach higher frequencies as well.
It should definitely be an upgrade to what you do, but I personally don't think you'll get a 50% performance boost.

My poor understanding says that the FPU takes a floating operation and converts it into integer maths, which the integer cores then solve. I assume that the FPU can handle the extra resources that are assigned to it (ie. 2 integer cores instead of 1) but it sounds like it is the bottle-neck in the CPU for my applications.

If it is the bottleneck, then I wont be able to use the full 8 cores and I am no longer comparing an octocore to a quadcore as you point out, which really suggests I shouldn't bother upgrading!
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post #15 of 18
Quote:
Originally Posted by Killhouse View Post

My poor understanding says that the FPU takes a floating operation and converts it into integer maths, which the integer cores then solve. I assume that the FPU can handle the extra resources that are assigned to it (ie. 2 integer cores instead of 1) but it sounds like it is the bottle-neck in the CPU for my applications.
If it is the bottleneck, then I wont be able to use the full 8 cores and I am no longer comparing an octocore to a quadcore as you point out, which really suggests I shouldn't bother upgrading!

Well, AFAIK the integer cores are actually 2 weaker integer cores than what is in a traditional CPU. So the single FPU can handle both integer cores, there's no bottleneck in the CPU itself. But, yeah I'm not sure what apps you are doing exactly but switching from 4 FPU's/4 integer cores to 4 FPU's/8 integer cores might not make a ton of difference. It does clock much higher though so you'd have a frequency advantage.

Perhaps someone on here with a PD can run whatever apps your running and compare their results to your PII? I know PD will be faster, but how much is the question..
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post #16 of 18
Quote:
Originally Posted by Killhouse View Post

My poor understanding says that the FPU takes a floating operation and converts it into integer maths, which the integer cores then solve. I assume that the FPU can handle the extra resources that are assigned to it (ie. 2 integer cores instead of 1) but it sounds like it is the bottle-neck in the CPU for my applications.
If it is the bottleneck, then I wont be able to use the full 8 cores and I am no longer comparing an octocore to a quadcore as you point out, which really suggests I shouldn't bother upgrading!

This a synthetic benchmark of the FPU from Guru3d. Hope this shed some light into what you are looking for.

http://www.guru3d.com/articles_pages/amd_fx_8350_processor_review,11.html

post #17 of 18
^ There ya go. If that relates to what you are doing in anyway it looks like it's quite a jump from the PII 980s/970s.
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post #18 of 18
Thread Starter 
Quote:
Originally Posted by flyin15sec View Post

This a synthetic benchmark of the FPU from Guru3d. Hope this shed some light into what you are looking for.
http://www.guru3d.com/articles_pages/amd_fx_8350_processor_review,11.html

Thanks, this is just what I was looking for. I will try and work out how that applies to my applications!

Quote:
Originally Posted by iinversion View Post

Well, AFAIK the integer cores are actually 2 weaker integer cores than what is in a traditional CPU. So the single FPU can handle both integer cores, there's no bottleneck in the CPU itself. But, yeah I'm not sure what apps you are doing exactly but switching from 4 FPU's/4 integer cores to 4 FPU's/8 integer cores might not make a ton of difference. It does clock much higher though so you'd have a frequency advantage.
Perhaps someone on here with a PD can run whatever apps your running and compare their results to your PII? I know PD will be faster, but how much is the question..

Thanks, that explains things very well. Seems like those reviews show just how much of an increase is expected (looks like quite a bit more than just the clock speeds).

Reps all around thumb.gif
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