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Where can a pair of single sided 1GB RAM Modules be found?  Looking for pair of 512s too

Posted on 2006-07-10
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I'm giving this one 500 points because I have yet to find any place that has any.  In case you need the info, I'm replacing CORSAIR XMS 2GB (2 x 1GB) 184-Pin DDR SDRAM Unbuffered DDR 400 (PC 3200) Dual Channel Kit System Memory on a MSI K8N Diamond Plus Mobo.

Please don't give me a link to Newegg and say just look here, they have everything.  Well I can't find what I'm looking for at Newegg but if you can please send me a link directly to that product page.  Thanks
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Question by:abpowell
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by:benab
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Hi abpowell,
I found these modules that will work for your board.  I don't know if they are single sided or not.  Is there a reason they need to be as long as they work for the board?

These are from crucial.com

2GB kit (1GBx2)
http://tinyurl.com/p5g65

1GB kit (512MBx2)
http://tinyurl.com/n8zw8


From Kingston.com
2GB kit (1GBx2)
http://tinyurl.com/nlb7r

1GB kit (512MBx2)
http://tinyurl.com/pkwnl


These are specified to work with the MSI K8N Diamond Plus motherboard.

hope that helps,
Ben
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by:abpowell
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Single Sided = more speed.

MSI specifies single sided chips to get the most speed so these if these are specified for the K8N, they could be.  My mobo will run on two side chips (it is now), but I can get more out of it with single sided chips I've learned.  If you want to know more, let me know and I'll post a link to that thread.
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by:abpowell
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All modules listed above are dual sided.  Need to clear this up too.  Single Rank will work as well.
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by:jamietoner
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you will only get more speed if your going for 4 sticks, if all you want is 2gbs the dual sided will be fine and there wont be a speed differnce, with 4 dual sided sticks the motherboard would clock the ram down and slow the clock latency. From i can find there arent any, the only single sided 1gb stick i have seen are ddr2 and it was registered ecc for a server.
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by:maramom
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by:maramom
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sorry! :(
according to the data sheet (link below) the above link appears to be erroneous, and the memory stick is actually double-sided: http://www.valueram.com/datasheets/KHX3200A_1G.pdf
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maramom earned 400 total points
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by:maramom
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The above (512) is single sided, Crucial CT6464Z40B.8T the .8T distinguishes it from it's CT6464Z40B double-sided twin. It apparently, can be ordered from Crucial as well as NewEgg, but don't forget the .8T
No luck on the !GB stick, yet!

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by:maramom
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I'm also trying to find that 512 module in a kit, so far, with little luck
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by:garycase
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You needn't worry about buying a "kit" => it's a nice marketing package and does guarantee the modules are "matched" --> but I have yet to see a pair of modules purchased together from the same manufacturer that would not work fine in dual channel mode.  In fact, I've NEVER purchased a "kit" -- just pairs of modules (i.e. 2 of the same module).

... as for a single-sided 1GB module ==>  still looking :-)   There were a few available a couple of months ago (I found a link for someone), but I'm having some difficulty finding one now (I suspect because the chips are hard-to-come by and are used almost exclusively for the higher-profit-margin registered RAM market -- I can find you single-sided 1GB Registered RAM, but that's not what you need)

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by:abpowell
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I have spoken with Crucial Tech Support and they don't make a single rank chip for my mobo.  Kingston does but it does slow down to 333 to go with the 2 1GB (I just say set garycase because they are usually cheaper that way) but I can get the cas down to 2.5 vs. the 3 I get if stayed with 400 Mhz.  I'm thinking that might be the way to go since I am doing video editing.  I really need 3gb Ram and it doesn't look like I can get single rank any other way.  Any comments on taking the 333 with the 2.5 CL Vs 400 with the 3 CL would be welcomed.
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by:garycase
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Simple math:  CL 2.5 at 333 MHz is the SAME CAS delay as CL 3 at 400 MHz  :-)

(333MHz = 3 nanoseconds per clock cycle  x 2.5 cycles = 7.5 nanoseconds;
 400MHz = 2.5 nanoseconds per clock cycle x 3 cycles = 7.5 nanoseconds)

So there's NO difference in the CAS delay running at either frequency.   But there is a difference in the memory transfer speeds -- since all of the cycles AFTER the CAS delay period are faster with 400MHz memory.

But as I've noted before, whether it's better to have 3GB of DDR333 or 2GB of DDR400 is very much application-dependent.   For MOST applications, the faster memory is better;  but for video editing that may not be true, since you'll be processing very large amounts of data.

If you do want to go to 3GB, I would buy 2 512mb single-sided modules (you can find single-sided modules in the 512mb size).   Then if in the future single-sided 1GB modules become available at a reasonable price, you could buy 2 of them and sell your current ones, and the system would step back up to 400MHz :-)
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by:abpowell
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Ditto on my other post from the thread
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by:abpowell
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This is harder than I thought and more expensive.  I am somewhat happy with the the two 1GB modules I have in now running at 400 with a CL of 2 so..........if I stick with the two 1GB dual channel (and dual sided) simply so I don' t I have to buy any more and then install the 512 set in the remaing 2 sockets.  I'm guessing I would run at 333, however my 1GB chips have CL of 2 and the 512s are 2.5.  I'm guessing this will give me 333 MHz with 2.5 overall CL, plus the extra gig.  Is there any benefit of going with the single sided 512s now.  (Other than as garycase noted that when the 1GB chips come available at a reasonable price I'll already have the 512s).  Because if not I may save some money now and go back with dual sided because by the time I get all the chips single sided there is no telling what technology will bring and I might need 4 totally new chips (running in quad channel mode!!)  
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by:garycase
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I agree there's no benefit to buying 512's now => you can just use the 4 1GB modules, since the system will run at 333 either way.   ... and if it's clocking okay at CL2 you probably still run at that CAS latency => although it MAY not be stable at CL2 with 4 modules.   The additional load on the address bus causes a significant degradation in the signaling waveform, so it may require more time to stabilize before it can reliably access the memory.   Personally I would simply run the system with 2GB.   It won't be long before you can buy 2GB modules -- a pair of those will let you max the memory and still run at 400MHz :-)   (of course you'll still only "see" around 3GB)
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by:graye
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...just a note to elimiate some confusion...

The "singled sided" attribute of a SIMM chip is more about the design of the module and doesn't have anything to do with whether or not the SIMM has chips on both sides.   Single Sided SIMM are designed to be run in pairs, and make up one logical "bank" of memory.

For example, the "CORSAIR XMS 2GB (2 x 1GB) 184-Pin DDR SDRAM Unbuffered DDR 400 (PC 3200) Dual Channel Kit System Memory" that you mentioned is probably already "singled sided".
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by:abpowell
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Nope those are dual sided.  You are correct for the most part on the SIMM chip.  But I think you are confusing Single Sided and Single Rank.  I can use either.  It's all in how the chip is read.  The single rank module can have chips on both side but functions as if it were single sided as it is being read.  
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