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TWIN2X2048-6400C4DHX or TWIN2X4096-6400C5DHX for my Asus P5N32-E SLI

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By tooon
in Memory

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I recently put together a new system with a Asus P5N32-E SLI mb and

two sets of TWIN2X2048-6400C4DHX memory to get me to 4GB. I've finally got Vista x64 stable with the MS patch and the latest BIOS from Asus and it runs all day long through benchmarks and stress tests.

 

After benchmarking with Sandra it looked like the memory bus was only being utilized ~55%. After reading around on these forums I realized that my memory is bumped down from 800 to 667 due to the 4 banks.

 

Should I try to trade in my TWIN2X2048-6400C4DHX for a set of TWIN2X4096-6400C5DHX? That will allow me to have 4GB of memory running at 800mhz.

 

What kind of performance differences will I see with 800mhz and CAS5 vs. 667 with CAS4? I'm figuring bus speed is more important than CAs timings but I wanted some 3rd party advice.

 

Thanks!

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DerekT

DerekT

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Should I try to trade in my TWIN2X2048-6400C4DHX for a set of TWIN2X4096-6400C5DHX? That will allow me to have 4GB of memory running at 800mhz.

 

It depends on how easy you can move hardware parts. If you can easily move the parts, then that's what I would do.

 

What kind of performance differences will I see with 800mhz and CAS5 vs. 667 with CAS4? I'm figuring bus speed is more important than CAs timings but I wanted some 3rd party advice.

 

2GB of Corsair 6400C4 @ 6400C4

(DDR2-800 4-4-4-12 Dual Channel)

 

Everest:

 

Latency = 59.9 ns

Read = 7413 MB/s

Write = 4859MB/s

2GB of Corsari 6400C4 @ 667C5

(DDR2-667 5-5-5-15 Dual Channel)

 

Everest:

 

Latency = 68.9 ns

Read = 6782 MB/s

Write = 4858 MB/s

 

Pretty Clear? Not really. This is theoretical bandwidth.

 

When I run SuperPi, there is a fair difference of more than a few seconds.

 

When I load Company of Heroes and use a digital stopwatch, the difference is a mere 1 second and FRAPS are 2 less on Counter Strike Source Benchmark.

 

When I load a 250MB 3D rendered (Maya) file and use a digital stopwatch, the differerence is less than 3s.

 

When I render a 700MB AVI file to DVD, it takes 1 minute 30 seconds longer than with 667.

 

So, yes, there is a difference. Marked in theoretcal benchmarks but less so in reality. It depends on the use you make of the system. In gaming, it makes little difference in load and almost none in FRAPS.

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Thanks for the reply, that's some good info.

 

How accurate is the memory information on the "Motherboard" page in Sandra XII? I've gone through and looked at that page for some more in-depth information on the memory I do have and came away with some interesting results.

 

I've got 2 x TWIN2X2048-6400C4DHX kits, so 4 x 1024 CM2X1024 DIMMs.

 

Looking at the DIMMs I notice that I've got 2 DIMMs with one serial # and 2 DIMMs with a different serial #. I'm looking at the number on the DIMM below the barcode.

 

Here are the properties in Sandra of the 4 DIMMs I have:

  1. CM2X1024C4D, Has Enhanced Performance Profile, manuf. date 7/16/2006
  2. CM2X1024C4DHX, No Enhanced Performance Profile, manuf. date 11/14/2159
  3. CM2X1024C4DHX, No Enhanced Performance Profile, manuf. date 11/14/2159
  4. CM2X1024C5DHX, No Enhanced Performance Profile, manuf. date 7/16/2006

 

That's the info I get from Sandra. The first two DIMMs have the same serial on the back and the second two have the same serial, but it looks like DIMMs 2 and 3 match up and DIMMs 1 and 4 are completely different.

 

What's going on here?

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Here are the properties in Sandra of the 4 DIMMs I have:

CM2X1024C4D, Has Enhanced Performance Profile, manuf. date 7/16/2006

CM2X1024C4DHX, No Enhanced Performance Profile, manuf. date 11/14/2159

CM2X1024C4DHX, No Enhanced Performance Profile, manuf. date 11/14/2159

CM2X1024C5DHX, No Enhanced Performance Profile, manuf. date 7/16/2006

Is your first module listed a DHX module? Also, are you planning to use the EPP profiles. If you are planning to run 4 modules then using SLI ready is not suggested. Also, you can try clearing the CMOS and checking the information again.
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Is your first module listed a DHX module? Also, are you planning to use the EPP profiles. If you are planning to run 4 modules then using SLI ready is not suggested. Also, you can try clearing the CMOS and checking the information again.

 

Yes, all four are supposed to be exactly the same. I was thinking of using the EPP profiles, but then I found the bus speed issue with the 4 DIMMs.

 

I'm starting to think that 2 x 2GB DIMMs would do better, since I would like to do SLI at some point.

 

I'll clear the CMOS and re-check everything tonight when I get home.

 

Thanks.

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I'm starting to think that 2 x 2GB DIMMs would do better, since I would like to do SLI at some point.

 

I'll clear the CMOS and re-check everything tonight when I get home.

 

Thanks.

Let us know how it goes. IMO, 2 x 2gb is a better option on 680i/650i boards. Also, you do not need SLI Ready memory to run your video cards in SLI mode. In this case, Nvidia uses the term "SLI" generically to denote their performance options. You can do SLI video with or without SLI Ready memory.

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I reset the CMOS and booted up and ran Sandra again and it came out with all the same information.

 

So it looks like I've got two correct matching DIMMs that have bizarre manufacture dates and different serial numbers. I also have two DIMMs that don't match at all and don't even show up as the type of memory I ordered even though they're labeled the same.

 

Should I return these to Newegg? What do you think about these readings I'm getting? I'll probably get the 2x2GB DIMMs anyways, but I'm not sure about returning these to them or to you guys directly.

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What is printed on the modules and did they come in a matched set?

Many programs like Si Soft will miss read the information in the SPD, and we do not input a serial number in the SPD or the date of manufacture as we use a different method to track the parts.

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taylor775

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Let us know how it goes. IMO, 2 x 2gb is a better option on 680i/650i boards. Also, you do not need SLI Ready memory to run your video cards in SLI mode. In this case, Nvidia uses the term "SLI" generically to denote their performance options. You can do SLI video with or without SLI Ready memory.

 

Ram guy,

Whats the word on 4 modules installed on the p5n32 e-sli. I remembered when the board was first released people were having all kinds of problems. I remember you telling people that 2 modules were always better than using 4. I went with the safe route when i first got my board but i want to make the 4 gig jump.

 

Has this drama cleared up? Should I go with (2) 2048 pairs or can I get away with the quad setup. My main goal is to at least get my basic speed (800). Im cool with 800 but it would be nice to hit 1066 with 4 gigs of ram. Last time I was on this board 1066 with four banks used was asking for trouble.

 

:)

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