Will PC2 1066 memoery work with my board?

[scca325is]

This is the board I have(P5N32-SLI SE Deluxe). The DDR standard for it is DDR2 800. However, it can take a 1066 FSB for a chip. I am going to buy a Conroe when they come back in stock, so I want a board that can handle 1066 memory. Is their such a board? Will the board I have handle it?

 

[AyashiKaibutsu]

The CPU FSB is quad pumped. DDR is double. so if you wanted a 1:1 ratio it would be 533 ram. Atleast from my understand that's how it works.

 

[scca325is]

An article I read from AnandTech informed that if you want peak perforamce, the FSB and memory speed have to match(i.e. 533FSB to DDR533). There was no mention of FSB being "quad-pumped".

 

[betasub]

It is true that both Intel's NetBurst CPUs and their new Core2Duo CPUs have a "quad-pumped" FSB, i.e. 1066MHz is a Quad Data Rate of the base 266 FSB clock. I don't know if the AT technical article on Core2Duo states this specifically, but I'm sure the (ancient) articles on NetBurst do. AK has pretty much got it right.

 

[scca325is]

So what yor saying is that if I run the new Conroe with a 1066FSB, I want to run DDR533? Somehow that doesn't seem right?

 

[Tweak155]

Originally posted by: scca325is
So what yor saying is that if I run the new Conroe with a 1066FSB, I want to run DDR533? Somehow that doesn't seem right?

That is right.

Just like 800fsb is DDR400. DDR = Double Data Rate = 400x2 = 800.

 

[imported_goku]

Originally posted by: Tweak155

Originally posted by: scca325is
So what yor saying is that if I run the new Conroe with a 1066FSB, I want to run DDR533? Somehow that doesn't seem right?

That is right.

Just like 800fsb is DDR400. DDR = Double Data Rate = 400x2 = 800.

lol, I don't think so.. DDR is of the initial rate. PC3200 memory or DDR400 is 200MHZ speed, but because it's double datarate it's 400MHZ. PC2700 or DDR 333 is 133MHZ, PC2100 or DDR200 is 100MHZ, PC4000 or DDR500 is 250MHZ. The reason why it's called PC4000 is because that's it's max theoretical memory bandwidth at Single Channel, at Dual Channel, it's 8000MB/s. Get it now? Yes your processor WOULD BE memory starved if you were running single channel, thats why they have dual channel. (2Xthe memory speed, then 2X the memory channels which equals the "quad pumped" of the processor.

Makes sense now, right? Well, hopefully at least.

 

[scca325is]

So if I actually run DDR800, in dual channel, I wll have 1600 total? Let me just ask this, with the board I have, can I run 1066 memory? and if I could, does that mean I am running 2132? Basically I want to run the best setup I can, and the AT article I read said that you want to match your FSB and Memory speed. So what should I do?

 

[dexvx]

At stock:

Conroe is 1066 FSB or 266Mhz x 4. To run 1:1, you need DDR2-533 (266x2).

DDR2-800 (2x 400) @ 1:1 is 1600FSB (400x4). So yea, you can use DDR2-800, it'll just be downclocked.

 

[betasub]

Originally posted by: scca325is
So what should I do?

Relax. Tweak your memory settings in BIOS. Benchmark. Max out your performance on your rig using a benchmark that means something to you. Don't rely on some third party benches on some other mb. Then post on ATforums telling us how to get the "best setup".

For a 1066 QDR FSB, 1:1 memory speed is DDR2 533. The motherboard BIOS is likely to support higher ratios, such as 4:5 (DDR2 667), 2:3 (DDR2 800) etc. Or you could overclock your FSB to, say, 1333 QDR FSB, so that 1:1 memory speed is DDR2 667, 4:5 now DDR2 800 etc. If you buy faster rated DDR2 DIMMs (like the 1066 memory you mention), you'll have the flexibility to choose higher memory ratios and/or overclock the FSB.