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Ram Speed

Post Date: 2008-01-08
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Euler View Drop Down
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  Quote Euler Quote  Post ReplyReply bullet Topic: Ram Speed
    Posted: 08 Jan 2008 at 4:26pm
If a non OC Q6600 is used is ram faster than 667 mhz needed?  Is there any significant increase in speed if using 800 mhz instead?  Thanks.
 
Twister Pro Case
Q6600
2gb Corsair 667 mhz ram
8800GT 512
WinXP Pro
320 GB Drive
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Tyler Lowe View Drop Down
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Posts: 0 		  Quote Tyler Lowe Quote  Post ReplyReply bullet Posted: 09 Jan 2008 at 12:39am
Rather than simply post with "no, it doesn't matter", I figured I would run a few benchmarks on my system, and share the numbers:
 
RAM speed benchmarks:

Test configuration:

Q6600 @ 2.4GHz, 1066MHz FSB

Windows Vista Home Premium 32 bit edition
ASUS EN8600GT


DDR2 PC6400 clocked @ 667 MHz 4-4-4-12 2T:


Cinebench R10:


Open GL: 2896

Rendering (1 CPU): 2420
Rendering (x CPU): 8210
 
SiSoft Sandra:

Multi-media Int (iit/s): 255284

Multi-Media Float (fit/s): 137838
Dhrystone ALU (MIPS): 39211
Whetstone FPU (MFLOPS): 29781


DDR2 PC6400 clocked @ 800 MHz 4-4-4-12 2T:

Cinebench R10:


Open GL: 2673

Rendering (1 CPU): 2409
Rendering (x CPU): 8218


SiSoft Sandra:

Multi-media Int (iit/s): 254321

Multi-Media Float (fit/s): 138166
Dhrystone ALU (MIPS): 39383
Whetstone FPU (MFLOPS): 29655

So, after the last half hour of benchmarking, what I have learned is: "no, it doesn't matter". Tongue

 
While there was some variation in the Open GL testing using Cinebench R10, I have seen that much variation in that particular test without changing anything. I am going to call differences of less than 250 pts in that benchmark insignificant.
 
 You can still see gains from the 800MHz RAM, but not with the increase in speed. If you downclock 800 MHz RAM to 667MHz, you can tighten up timings, and that will improve performance. I could benchmark that one for you, but overclocking memory is a crapshoot. Just because my RAM can hit a particular timing set, doesn't mean the RAM that gets shipped in your system will be of the same quality. It could be better, or worse.
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Euler View Drop Down
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  Quote Euler Quote  Post ReplyReply bullet Posted: 09 Jan 2008 at 4:46pm
THank you very much for the effort and the information Tyler.  That really helps. 
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Minion View Drop Down
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Posts: 112 		  Quote Minion Quote  Post ReplyReply bullet Posted: 09 Jan 2008 at 11:22pm
I agree well done Tyler !!
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Solo View Drop Down
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Posts: 395 		  Quote Solo Quote  Post ReplyReply bullet Posted: 09 Jan 2008 at 11:24pm
Tyler is probably laughing because he made all of that up...
 
 
nah, good job :D  nice to see how I wasted my money on 1066 RAM :)
 
thanks
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