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Multiplier vs GFlops

post #1 of 14
Thread Starter 
One thing I noticed through my (almost inexisting) overclocking experience is that when I increase the fsb and lowers the multiplier the amount of GFlops is lower than a lower fsb+high multiplier combo.

For instance, in my system, while running linx, with 381x10.5 I get an average of 26 GFLops while with 401x10 I only get 23.5 GFlops.

Why is that? In terms of performance, is better to opt for a low fsb high multiplier combo?

Sorry if this is a noob question, but I just want to learn more
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post #2 of 14
Had this discussion not to long back, similar question... different setup, concept seems the same... worth a read anyways...

http://www.overclock.net/amd-general...ultiplier.html
 
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Yukikaze
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post #3 of 14
does your ram speed decrease when you increase the fsb?

i.e. do you have to decrease the ram speed in the bios to keep it stable?

becuase if your RAM is running at a lower speed then you will get a lower speed
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post #4 of 14
Flops is the amount of the amount of floating operations performed in a second. The higher your frequency is the higher your Flops. Since the CPU requires the FSB(to send info in and out from your RAM) to perform many operations its no wonder why your Flops drop when you drop the FSB frequency.
post #5 of 14
Quote:
Originally Posted by dominique120 View Post
Flops is the amount of the amount of floating operations performed in a second. The higher your frequency is the higher your Flops. Since the CPU requires the FSB(to send info in and out from your RAM) to perform many operations its no wonder why your Flops drop when you drop the FSB frequency.
He says in his post that the Flops DECREASE when he INCREASES his FSB
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post #6 of 14
Thread Starter 
I think you are not getting my point. 401x10 has a higher fsb (401) that 381x10.5, fsb (381). The cpu speed is roughly the same ~4GHZ. I suppose that I would get the same GFlops because the cpu freq is the same. But what happens is that I get higher GFlops with 381 fsb and 10.5 multiplier (around 26GFlops) and lower GFlops with the 401 fsb and 10 multiplier (23.5 GFlops).
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post #7 of 14
Logically you will get a higher score with a higher FSB due to the fact that a higher FSB allows for more bandwidth through the RAM.

I am unsure as to why you are getting non logical results. What speeds are your RAM running at the higher and lower FSB speeds?
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post #8 of 14
Thread Starter 
At 380fsb my ram is running at 475 Mhz (4:5 ratio), and with 400 fsb it's running at 500 Mhz.
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post #9 of 14
hmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmm mmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmm mmmmmmm

i have nfi

One thing i know is that intel burn test is extremely temperamental, i have seen changes in Gflops just by changing the core voltage. I would use a few different testing methods, if they show differences in performence then i would look into it more.
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post #10 of 14
Thread Starter 
Ok, thanks. I'll try to run some benchmarks and see the difference... +1 for the help
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