is ddr800 good for Asus P5WD2 Premium

Hi, i want to buy the Asus P5WD2 Premium and some things are just confusing for me. for exmaple, the processor i'm going to install on it is intel 3.4ghz 800fsb and i want to get a ddr800 memory, now the question is that a good choice? i'm thinking since the memory is operating at 800 mhz and the fsb 800 that this is not a good match, but i'm not a computer expert? Also could someone simply explain Silicon Image 3132 SATA controller, I see this in the specs for the asus motherboard but don't quit get what it is i good for exactly? Thank you for reading this.

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Im confused because everything that I have read and even Corsair had told me at one time that the 8000UL was the best. Im going to research this.

ASUS P5WD2 Premium
Intel 3.73 EE @ 5.6Ghz
XMS2 DDR2 @ 1180Mhz

<A HREF="http://valid.x86-secret.com/records.php?PHPSESSID=792e8f49d5d9b8a4d1ad6f40ca029756" target="_new">#2 CPUZ</A>
SuperPI 25secs

well i'm going to be using it for games, watching videos ect... But what i was trying to say is that since my processor is running at 800 fsb and my ram runs at 800 mhz than wouldn't this trouble the processor, where else if i had a processor that ran at 1066 fsb and same ram, than it would be of a less of a problem. Unless i'm wrong, than again, i'm kinda new to this.

Hi, i understood everything in your reply but i got lost when you said this:

"Now since these board use DUAL channel, they have 2X DDR400 channel, some marketing people called it FSB800 when its actual runnin 2(# of channel) X 200mhz X 2 (2X the data...).

So Running DDR2- 800 in dual channel will give you 2X the bandwithc of your cpu..."

when you say 2x ddr400 channel, meaning that memory is running at ddr 800?
If i understand correctly fsb means how fast is the motherboard communicating with the hardware, right?

now this i very lost at this statment "actual runnin 2(# of channel) X 200mhz X 2 (2X the data...)"?

sorry to bother you with all these questions, thank you all for replying to my thread.

Ummm, I think you've got this partially wrong - right in the idea, wrong in some details.

Intel uses what is called "Quad-pumped" FSB which is where data is transferred 4 times per clock tick. So, that 800FSB is really 200mhz, with data transferred 4 times per tick. (1066fsb is 266mhz x 4)

Memory, DDR400, DDR533, etc. (DDR or DDR2 doesn't matter, its the same at this level) is Double Data Rate. So you get a 200mhz clock and 2 transfers per tick for DDR400. (DDR533 = 266mhz x 2 tx/tick)

Dual channel doesn't change the speed (in mhz), but it does make the path wider (like a highway - good analogy )

FSB and Memory speed are actually 2 different things. FSB is the bus between the CPU and the northbridge, memory speed is the speed the memory runs at and can be different (hence the dividers, and other settings for memory:fsb). Its generally considered best for FSB and memory to run at the same speed, so its common to have it considered the same.

Intel's 200mhz QDR FSB (effective 800mhz) is a perfect fit bandwidth-wise for dual-channel DDR400 RAM (or DDR2). The 1066 FSB is the same - a perfect fit for DDR533 RAM in dual channel.

DDR800 RAM is currently overkill for any but high-end overclockers (but you said that already). If your mobo supports a DDR800 memory speed setting, you could probably run it single channel and get similar performance to dual-channel DDR400 memory. I don't know of any that do however.

Mike.

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The voltages stay pegged out on that rig

ASUS P5WD2 Premium
Intel 3.73 EE @ 5.6Ghz
XMS2 DDR2 @ 1180Mhz

<A HREF="http://valid.x86-secret.com/records.php?PHPSESSID=792e8f49d5d9b8a4d1ad6f40ca029756" target="_new">#2 CPUZ</A>
SuperPI 25secs

Okay, so according to what you saying, than it is safe to run a single ddr2 800(pc2-6400) on the Asus P5WD2 Premium, even when you motherboard runs at 800 fsb. Also the dual channel with ddr2 800(pc2-6400) should work, right? what do you think( and everyone else )? thank you.

hi, so with dual channel, the memory is still at the same speed, 800 mhz, but now i'm sending more information, instead of 6400 it will be sending 12800? And the processor that is 3.4 ghz, fsb 800 mhz, 1mb cache will be able to take advantage of that bandwidth and speed, correct?? thank you.

The CPU has a 64-bit wide bus. The memory has a 64-bit wide bus. Dual Channel makes two modules parallel, for a 128-bit wide bus, doubling the data transfers.

The P4 with 800 bus runs at 200MHz at Quadruple Data Rate, similar to how AGP4x runs at 4x. DDR SDRAM at 200MHz clock speed runs DDR400.

DDR400 in dual channel mode would be a perfect match for a P4 with 800 bus, because 400x2=800.

The math is actually a bit more complicated, for the CPU it's clock x data rate x 64 bits, or 200x4x64=512000 megabits per second, divide that by 8 to get 64000 megabytes per second, or 6.4GB/s. But for the RAM, dual channel gives you 128-bits rather than 64, so it's clock x data rate x 64 bits, or 200x2x128=512000Mb/s=6400MB/s=6.4GB/s. So DDR400 in dual-channel mode has the same transfer rate as a P4 with 800 bus.

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You can run the memory bus at a higher data rate than the CPU bus, but without any performance advantages.

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Umm you're right...
What I ment though is that on some MotherBoard boxes, you see it advertised as FSB800 motherboard.

Anyhow thansk for pointing out...sometimes when I try to explain it, it comes out not tottaly accurate...

Bah important part is he understands it now!

Asus P4P800DX, P4C 2.6ghz@3.25ghz, 2X512 OCZ PC4000 3-4-4-8, MSI 6800Ultra stock, 2X30gig Raid0

well the ASUS P5WD2 Premium i believe it says that it supports ddr2 800. But i think if i'm going to buy a memory it would be two ddr2 400 running in dual channel because it is much cheaper than ddr2 800. Also if i were to buy ddr2 533, i think the motherboard would be able to downgrade it to ddr2 400 so that it can match fsb 800 and than if i were to upgrade to process that runs at fsb 1066 i could just increase speed to 533 to it's adveristed speed. i think i read this in tomshardware in one of the articles, unless i'm wrong.

I going to be using it for games, watching movies, web design, school, programming that kind of stuff.