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new AMD processor questions - Page 8

post #71 of 72
Quote:
Originally Posted by chrisjames61 View Post

So the eight core will be faster than a four core at the same clock speed in theory? Because you will have a full module with two cores where as a four core you may only get a core instead of a full module? Wouldn't this only be a factor in certain workloads?

I think it's in general. The quad-module definitely wins in FPU performance, but I think the decoder is also shared between the two cores. I'm not entirely familiar with how a CPU instruction or cycle - much less a unique design like CMT - progresses to completion.
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post #72 of 72
Just to shed some light on Kaveri vs Vishera in a multithreaded fp workload: y-cruncher

First, here are times reported to the benchmark's author that he has recorded on his site:

http://www.numberworld.org/y-cruncher/benchmarks/charts/1b.html

Those are execution times for the y-cruncher pi benchmark with pi being calculated to 1 billion places. Note Alexander Yee's FX-8350 running the xOP codepath:

307.381 v0.6.7 x64 XOP Miyu Windows Ram Only Alexander Yee 1 AMD FX-8350 4.00 GHz 16 GB DDR3 1333 MHz

Now take a look at my Kaveri chip (7700k) @ 4.7 ghz:

https://www.dropbox.com/s/wn82ml3tr7fo80l/linux7700ky-cruncher1g4700CPU2100NB.png?dl=0

Normalized for clockspeed, that 8350 of Mr. Yee's should be able to complete the 1b bench in about 284 seconds @ 4.7 ghz. If he were to then disabled two modules entirely (making it a 2M Vishera @ 4.7 ghz), it should take the half-a-8350 ~568 seconds to complete the 1b bench. My 2M Kaveri @ 4.7 ghz does it in ~470 seconds. That's about 34.5% faster per module, assuming a reduction in execution time from 568 seconds to 284 seconds represents a speed increase of 100%.

Yeah, Steamroller is faster per module. It isn't faster overall because it only brings half as many modules to the party. But if you are running software that only uses 4 threads, then Kaveri is the better pick at the same clockspeed.
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