I read that with higher speed processors like 3.0 ghz you will not see the full benefits from ram like Corsair's XMS PC4400, but with 2.4 or 2.6 you would. Can anyone tell me how this is possible? I am not really sure how that is so. Any details are appreciated. I am thinking about going to a 3.0c P4 and 1gb of XMS PC4400..anyone know how this would work and if there would be a better set up? Thanks in advance.
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Question about CPU & Ram speed...
- Thread starter Antonius
- Start date
I'm not quite sure why so many people have trouble grasping this concept, but I will try to explain it as simply as possible.
All the processors you mentioned run on the same bus speed....200 Mhz (quad pumped to 800 Mhz). At stock speeds, your would run your memory at 200 Mhz also (Double pumped to be 400 Mhz, or PC3200 (DDR400). The reason people get higher speed memory is to be able to maintain a 1:1 ratio with the processor's bus speed. Meaning, if you OC your processor to run at a 250 Mhz bus speed, you'd want memory capable of 250 Mhz, which would be PC4000 or DDR500. If you buy PC4400, all that means is you have more head room over the standard PC3200. It is all simply, basic, 3rd grade math. Put everything down to the actual bus speeds, and it all makes sense.
All the processors you mentioned run on the same bus speed....200 Mhz (quad pumped to 800 Mhz). At stock speeds, your would run your memory at 200 Mhz also (Double pumped to be 400 Mhz, or PC3200 (DDR400). The reason people get higher speed memory is to be able to maintain a 1:1 ratio with the processor's bus speed. Meaning, if you OC your processor to run at a 250 Mhz bus speed, you'd want memory capable of 250 Mhz, which would be PC4000 or DDR500. If you buy PC4400, all that means is you have more head room over the standard PC3200. It is all simply, basic, 3rd grade math. Put everything down to the actual bus speeds, and it all makes sense.
Ok, I get the fact that the bus speeds determine it, and if I had PC4400 it would only give me more OC room..but what I don't fully grasp is how a 2.4c is different from a 3.0 if BOTH run at 200mhz quad pumped. Wouldn't they both perform the same then with PC4400 ram? Why have I read that 2.4 will perform better with PC4400 type ram instead of like a 3.0? Also, are there any chips that run at a different bus speed so as to allow for more optimal use of the DDR bus speed?
Originally posted by Antonius
Ok, I get the fact that the bus speeds determine it, and if I had PC4400 it would only give me more OC room..but what I don't fully grasp is how a 2.4c is different from a 3.0 if BOTH run at 200mhz quad pumped. Wouldn't they both perform the same then with PC4400 ram? Why have I read that 2.4 will perform better with PC4400 type ram instead of like a 3.0? Also, are there any chips that run at a different bus speed so as to allow for more optimal use of the DDR bus speed?
First thing is to stop listening to whoever is feeding you this crap. Second, just because two processors run at the same bus speed, doesn't mean they will perform anything like each other. It's a simple mathematical relationship. Your forgetting the multiplier, which determines the processors speed. It's true that a faster processor will better use memory. Meaning that a 3.0 Ghz processor in the same board and with the same memory will probably pull a little more performance than a 2.4 in the same system, but that's only because the processor is faster. Take some time and read up on what a bus speed is, and what it means to overclock. Memory performance is mainly determined by the bus speed it's running at...not which processor is sitting in the same system. Your not understanding how you overclock and what makes a 3.0 Ghz processor faster than 2.4.
Originally posted by Antonius
Ok, I think I am getting a better idea. One thing though...am I correct in my belief that there are no processors currently that can take FULL advantage of the speed of PC4400 (or even 4000) ram without OCing?
Yes, that part you are correct on. I am not sure of the speeds of the Athlon64 (it's FSB), but I don't believe anything will utilize anything faster than DDR400 without overclocking. So, you'd be wasting your money getting PC4400 unless you were going to do some heavy heavy overclocking.