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RAM divider 1:1 or higher?

post #1 of 8
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Hey guys, I recently read in a FAQ here that u should not have your memclock higher than your FSB (for DDR). but a bunch of other ppl have told me otherwise. now i'm thoroughly confused. Anyone know more about this?
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post #2 of 8
If you have your FSB running at 200 MHz, that means it talks with the RAM 200 times every second. If the RAM is going at 300 MHz, that means it has its data ready to be sent 300 times per second, so that leaves 100 times at best that the RAM will be ready to send data but the FSB will not be ready to receive it, hence why people say running RAM faster than FSB does not increase performance. That's the way I understand it, anyway. However, some people report higher benchmark scores when RAM speed is increased past the FSB, so I don't know what to tell you there. It could have something to do with the fact that the FSB and RAM not being syncronized, though that is entirely speculation.
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post #3 of 8
Its not a point of 'shouldnt'.

Its just that some people have the point of view that (in theory) it shouldnt give any performance benefits, as it can only handle data at the speed the CPU sends it data.

On the other hand, why not have your RAM faster? It wont slow you down, and if you can, go for it!

I think with AMDs (and DDR in general) your limiting factor is often your memory, and so you normally have to put it on a divider to make it SLOWER than your RAM, just to get your OC stable.

With Intels though, and DDR2, you can normally run the RAM alot faster than the FSB without any effort.
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post #4 of 8
Quote:
Originally Posted by noxious89123 View Post
On the other hand, why not have your RAM faster? It wont slow you down, and if you can, go for it!
Faster RAM speed sacrifices timing, so you need to take that into consideration too when overclocking. That is the main reason I see for not overclocking the RAM past a 1:1 ratio with the FSB.
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post #5 of 8
What are you guys talk'n about?
Show me Superpi runs that show faster memory makes no difference..at any FSB.
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post #6 of 8
I'll do some tests when I get new memory - my board can do 250mhz RAM with 200mhz FSB but my RAM can't
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post #7 of 8
Quote:
Originally Posted by stargate125645 View Post
If you have your FSB running at 200 MHz, that means it talks with the RAM 200 times every second. If the RAM is going at 300 MHz, that means it has its data ready to be sent 300 times per second, so that leaves 100 times at best that the RAM will be ready to send data but the FSB will not be ready to receive it, hence why people say running RAM faster than FSB does not increase performance. That's the way I understand it, anyway. However, some people report higher benchmark scores when RAM speed is increased past the FSB, so I don't know what to tell you there. It could have something to do with the fact that the FSB and RAM not being syncronized, though that is entirely speculation.
I just thought I'd remind you that Hz is 1/s. If it were 200 Hz, it would be 200 times a second, but this is measured in Mhz.

In other words, 200 Mhz is 200 Million cycles per second. I think we'd cry if it executed only 200 per second. :-)

Just a heads up.
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post #8 of 8
If I am not mistaken, AMD has different rule regarding fsb and ram speeds than intel. Since AMD run a 200 fsb stock, I don't see how you are expected to run it at the same speed as RAM.



For example: If I run my CPU stock, it has a 200*10=2000mhz. If I am running DDR2 800, I would have a /5 divider. So, 2000/5=400mhz, 2 times the FSB. Due to the memory controller on AMD, it is different animal than Intel.

look here at the bottom:http://www.neoseeker.com/Articles/Ha...lon64oc/4.html
or, read the whole article. Good info if a bit dated.
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