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post #81 of 349
Memory benchmarks are not accurate measurements of real world memory performance. If you have a timing of 3-3-3-6 and 800 cycles per second (DDR2-800) you will have 15 a clock cycle delay (or .01875 seconds) between the time the RAM requests the data and the time the data is sent to the CPU. With 5-5-5-15 and 1200 cycles per second (DDR2-1200) you will have a 30 clock cycle delay (.02500 seconds) between the time the RAM requests the data and the time the data is send.

So as you can see the total latency of the DDR2-800 memory rated at 3-3-3-6 is smaller than the latency of DDR2-1200 memory rated at 5-5-5-15.

Now you have to transfer the data to the CPU. And guess what? The bandwidth of the memory doesn't matter! It is the bandwidth of the CPU's FSB that determines the speed at which the memory communicates with the memory! So if this CPU has a FSB of 1066Mhz it has a 4358.144MB/s bandwidth. Meaning the DDR2-800 and DDR2-1200 will take the same period of time to transfer the data to the CPU's FSB.

Regardless, the actual transfer time is very small, and it appears the latency of the DDR memory is the largest accumulation of time.

This reasoning makes the DDR2-800 more attractive.

Now, all this stuff came from my understanding of how computers work, and my research that I just did. This could contain some error as I am in no way a computer engineer. This is also assuming no bottlenecks with CPU. That is my disclaimer.
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post #82 of 349
Quote:
Originally Posted by pauldovi View Post
Memory benchmarks are not accurate measurements of real world memory performance. If you have a timing of 3-3-3-6 and 800 cycles per second (DDR2-800) you will have 15 a clock cycle delay (or .01875 seconds) between the time the RAM requests the data and the time the data is sent to the CPU. With 5-5-5-15 and 1200 cycles per second (DDR2-1200) you will have a 30 clock cycle delay (.02500 seconds) between the time the RAM requests the data and the time the data is send.

So as you can see the total latency of the DDR2-800 memory rated at 3-3-3-6 is smaller than the latency of DDR2-1200 memory rated at 5-5-5-15.

Now you have to transfer the data to the CPU. And guess what? The bandwidth of the memory doesn't matter! It is the bandwidth of the CPU's FSB that determines the speed at which the memory communicates with the memory! So if this CPU has a FSB of 1066Mhz it has a 4358.144MB/s bandwidth. Meaning the DDR2-800 and DDR2-1200 will take the same period of time to transfer the data to the CPU's FSB.

Regardless, the actual transfer time is very small, and it appears the latency of the DDR memory is the largest accumulation of time.

This reasoning makes the DDR2-800 more attractive.

Now, all this stuff came from my understanding of how computers work, and my research that I just did. This could contain some error as I am in no way a computer engineer. This is also assuming no bottlenecks with CPU. That is my disclaimer.
I totally agree with you, as I earlier stated I am not striving for the highest benchmark rating, as that is worthless. I am going for the best possible frame rate in games. Now with what you just said, you lead me to think that my memory settings are better in games than Drax's?.....not saying mine are better than yours or vica-versa, I am just trying to understand what is the better option for real world memory usage
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post #83 of 349
Thread Starter 
Quote:
Originally Posted by Intervention View Post
I totally agree with you, as I earlier stated I am not striving for the highest benchmark rating, as that is worthless. I am going for the best possible frame rate in games. Now with what you just said, you lead me to think that my memory settings are better in games than Drax's?
Well, aside from memory and mobo, we have the same setup.

You wanna set something up to test that? Run AM3 or something?

CPU at 3.6ghz
Ram at whatever

Ok?
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post #84 of 349
Quote:
Originally Posted by Drax View Post
Well, aside from memory and mobo, we have the same setup.

You wanna set something up to test that? Run AM3 or something?

CPU at 3.6ghz
Ram at whatever

Ok?
3DMark06 would be better. AM3 is old now.
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post #85 of 349
Tomorrow, I want to see if my setup if 18 hours orthos stable. Remember, I'm not trying to start a fight here, just curious.

Sure, we can have a AM3 or 3DMark06 shootoff. Just clock you 7950 to my speeds, 600 core 725 mem, and we'll give it a shot. Also, I prefer if you set cpu to 3.5GHz, havent had mine to 3.6 yet, but are sure it would be able to.
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post #86 of 349
Quote:
Originally Posted by Intervention View Post
Tomorrow, I want to see if my setup if 18 hours orthos stable. Remember, I'm not trying to start a fight here, just curious.

Sure, we can have a AM3 shootoff. Just clock you 7950 to my speeds, 600 core 725 mem, and we'll give it a shot
Yeah finally some benchies=tomorrow?Show me the scores.Please maked big numbers.Good luck.
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post #87 of 349
Now if you can get DDR2-1200 at 4-4-4-8, you beat DDR2-800 @ 3-3-3-6

I tried my Crucial DDR2-1000 5-5-5-15 (stock 2.2V) @ DDR2-800 3-2-2-4 (2.3V) Doesn't work though.... Maybe if I crank up the voltage to 2.4V?
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post #88 of 349
I still think you should try both my memory setting and your current settings as my ram will never do 1260Mhz, but am almost certain, you could achieve my settings. That would eliminate the mobo difference.
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post #89 of 349
Quote:
Originally Posted by Intervention View Post
I still think you should try both my memory setting and your current settings as my ram will never do 1260Mhz, but am almost certain, you could achieve my settings. That would eliminate the mobo difference.
I believe we have the same memory. There are people running it at 1360 all day @ 2.4V.
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post #90 of 349
I wasnt talking to you paul, I was talking to Drax. That way the test could be run off of the same computer as that would eliminate any offsets due to differing parts.

Yes we do have the same memory. If im stable when i get home from school tomorrow, I will try again at maybe 3-2-2-8 or maybe 3-2-3-6. Awesome memory though paul, especially if you got it like me when it was 100$ off


My bad, I realize what you were saying. I'd rather not push it too far though. From here on in, I'll try to tighten timings insteaqd of push for Mhz.
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