InclininWirefre Posted May 19, 2005 Share Posted May 19, 2005 hello! =- Total Buget: $ 350- 400 =- Options: - CM72SD512RLP-3200 (@ 3-3-3-8) x 4 DIMMs @ approx. $ 390 - CMX512RE-3200LL (@ 2-3-2-6) x 2 DIMMs 2 approx. $ 375 Qs. 1) On a mobo, such as the Asus K8N-DL, that allows CAS Latency adjustments to the tune of 2-2-2-5 as well as DIM voltage options, which of the abve 2 options will provide for better prfrmnce? Qs. 2) Asus K8N-DL's specs declare System Bus @ 1600/2000 MT/s...If my understanding is correct, that equates to 800/1000 MHz...A PC3200 provides data speeds of 400 MHz...Now, i can c how installing exactly two PC3200 DIMMs adequately supports the System Bus...Wud adding any more DIMMs help? I reckon i am missing a piece of the puzzle here somewhere since there r 6 DIMM slots on the mobo... I have referred to the DDR Memory Architecture whitepaper on Kingston's website (http://www.kingston.com/newtech/MKF_520DDRWhitepaper.pdf) for an understanding of the above...Interestingly, all figures & understanding of bandwidths & speeds is deviod of the memory size!? So my 3rd and final question is... Qs. 3) Where, and to what degree, is the 128/256/512/1024 MB storage employed? a nudge in the right direction to get the ball rollin' wud b gr8ly appreciated...thx. P.S.: My Asus K8N-DL wud b employing 2 Opteron 246s Link to comment Share on other sites More sharing options...
Corsair Employees RAM GUY Posted May 19, 2005 Corsair Employees Share Posted May 19, 2005 I would suggest - CMX512RE-3200LL (@ 2-3-2-6) x 2 Dims 2 approx. $ 375 for best performance. Qs. 1) On a mobo, such as the Asus K8N-DL, that allows CAS Latency adjustments to the tune of 2-2-2-5 as well as DIM voltage options, which of the above 2 options will provide for better performance? A: - CMX512RE-3200LL (@ 2-3-2-6) x 2 Dims 2 approx. $ 375 Qs. 2) Asus K8N-DL's specs declare System Bus @ 1600/2000 MT/s...If my understanding is correct, that equates to 800/1000 MHz...A PC3200 provides data speeds of 400 MHz...Now, i can c how installing exactly two PC3200 Dims adequately supports the System Bus...Would adding any more Dims help? I reckon i am missing a piece of the puzzle here somewhere since there r 6 DIMM slots on the mobo... A: The System Bus @ 1600/2000 MT/s refers to the Chipset frequency or interconnect between the north and south bridge. The memory Buss is separate. Link to comment Share on other sites More sharing options...
InclininWirefre Posted May 20, 2005 Author Share Posted May 20, 2005 hi! appreciate that! A few imp tid-bitz from gamepc on K8N-DL:: http://www.gamepc.com/labs/print_content.asp?id=asusnf4pro&cookie_test=1 - The nForce4 Pro 2200 is a single chip solution, which means that there is no Northbridge and Southbridge to speak of. - On both sides of the CPU sockets are DDR memory slots, two on the left side, one on the right. These are standard 184-pin DDR sockets, capable of handling ECC/Registered DDR-400 memory modules, which are needed for all Opteron platforms, since the memory controllers are housed in the processors themselves. - Unlike most standard-ATX class Opteron platforms, the K8N-DL has two independent memory busses. This means that each Opteron processor controls its own set of dual channel DDR memory slots, which theoretically allows this motherboard to support memory bandwidth levels of 12.8 GB/s (6.4 GB/s bandwidth per CPU). In order to take advantage of such bandwidth, you would need to use a minimum of four DDR memory modules (two for each CPU) and a NUMA aware operating system such as WinXP. - Some may view dedicated memory channels as a negative. Having two dedicated memory busses will typically increase memory latencies by a noticeable margin. In our tests, we found that with modules connected to each CPU, our latencies were roughly 10% higher compared to if all of our modules were connected through a single memory bus. Nevertheless, the massive bandwidth of a NUMA aware system with two memory busses is typically a desirable feature, even if latencies rise slightly. - Testbed System Configurations: 4 x Corsair XMS ECC Registered DDR-400 (PC-3200) Memory - 2 GB Total CAS 2,3,2 Latency at DDR-400 Speeds - Our tests show that across the board, our nForce4 Pro 2200 board performed better than Tyan’s legendary Thunder K8W Opteron platform, which has dominated high-end Opteron system sales since it was originally released. The performance differences are small, but that’s to be expected considering that Opteron processors have on-die memory controllers, which does not allow their engineering talent in terms of designing memory controllers truly shine. haha...i knw we've come full circle...wud u still suggest 2 XMS DIMMs or 4 CM72SD512RLP-3200 DIMMs? wud appreciate ur advise...thx! Link to comment Share on other sites More sharing options...
Corsair Employees RAM GUY Posted May 20, 2005 Corsair Employees Share Posted May 20, 2005 That is your choice as to what you can afford, but our XMSRE-3200LL modules would give the best performance. Link to comment Share on other sites More sharing options...
InclininWirefre Posted May 22, 2005 Author Share Posted May 22, 2005 That is your choice as to what you can afford, but our XMSRE-3200LL modules would give the best performance. hi! RAM Guy, appreciate the response! W.R.T. to your comment on what i can afford, well, i can presently afford either 4 CM72SD512RLP-3200 DIMMs or 2 CMX512RE-3200LL DIMMs... Elsewhere, i am being pushed towards buying 4 CM72SD512RLP-3200 dimms regardless of size right of the bat...that way each cpu could have access to its own local memory bank...this will make more difference than anything i'll see in cas latency differences when pushing large amounts of data, i m told... More generically, which factors contribute to a RAM module's performance other than its core speed and CAS latency figures? Specifically, would the performance of two (2) DIMMs of CM72SD512RLP-3200 (@ 3-3-3-8) when tweaked to 2-3-2-6 be EQUAL to the performance of two (2) DIMMs of CMX512RE-3200LL (@ 2-3-2-6)? final words of wisdom b4 i place my orders? :): Link to comment Share on other sites More sharing options...
Corsair Employees RAM GUY Posted May 23, 2005 Corsair Employees Share Posted May 23, 2005 I would tend to agree, the difference would be about 300-600 Mbs in memory bandwidth. And unless you are doing somethink that is CPU/memory intensive you may have better over all performance in this case with 4 modules. Link to comment Share on other sites More sharing options...
InclininWirefre Posted May 24, 2005 Author Share Posted May 24, 2005 Photoshop, Premiere, Flash and 3D MAX are my fav apps! ...all these applications will b used. :confused: new finding: Qs.) Would the performance of two (2) DIMMs of CM72SD512RLP-3200 (@ 3-3-3-8) when tweaked to 2-3-2-6 be EQUAL to the performance of two (2) DIMMs of CMX512RE-3200LL (@ 2-3-2-6)? Ans.) Yes (http://forums.extremeoverclocking.com/showthread.php?p=1754042#post1754042) RAM Guy, I wud appreciate ur advise b4 i place in my orders tomm...thx! Link to comment Share on other sites More sharing options...
Corsair Employees RAM GUY Posted May 24, 2005 Corsair Employees Share Posted May 24, 2005 Tomm I really doubt that CM72 parts will run those timings. Link to comment Share on other sites More sharing options...
InclininWirefre Posted May 25, 2005 Author Share Posted May 25, 2005 thx for the quik reply! So, in light of the applications I use and the memory bandwidth differences you refrred to in ur second to last post, where wud ur preferences lie? 2 CMX or 4 CM72? lk fwd to ur advise... cheers! P.S.: Just outta curiousity,which factors contribute to a RAM module's performance other than its core speed and CAS latency figures? Heat dissipators, for example, wud b one, since u spoke abt stability... Link to comment Share on other sites More sharing options...
Corsair Employees RAM GUY Posted May 25, 2005 Corsair Employees Share Posted May 25, 2005 There are some questions that would need to be answered for me to make a suggestion. But in a nut shell If the MB in question does not have the options to set the Dim Voltage and timings in the bios I would suggest you go with a JEDEC compliant module IE: CM72 modules. But if you do have the options in the bios for Dim Voltage and timings then our XMSRE-3200LL would be a faster module. I do have this MB that I can check and many of the Server MB's will not give these options, so that would be what I would do to ensure I don’t have problems, or at least if I do I can over come them by manually setting some of the settings. Hope that helps you. Link to comment Share on other sites More sharing options...
InclininWirefre Posted May 25, 2005 Author Share Posted May 25, 2005 hey RAM Guy, This is to confirm that the K8N-DL does have options in the bios for Dim Voltage and timings... Howevr, pls review the following opinion I received at my thread at extremeoverclocking.com (http://forums.extremeoverclocking.com/showthread.php?p=1754042#post1754042) "In general, more quantity of memory is more important than tighter timings (once you get to about 2gb in 32bit OS's). Meaning if for the same price, you get 2gb of loosely timed memory, you would be better off than getting 1gb of tight timed memory (especially for dual CPU)." wud u agree w/ the above? Link to comment Share on other sites More sharing options...
Corsair Employees RAM GUY Posted May 25, 2005 Corsair Employees Share Posted May 25, 2005 Well yes, but only with the exception of the Version of O.S. you are using. Windows XP for example is really optimized for 512 to 1 Gig of memory and the system will actually slow some what in certain applications with more than 1.0 Gig of memory. However, Linux or the 64 Bit version of Windows will handle memory differently and then the more memory would be an advantage. However, taking into the account of the Dual AMD 64 Bit architecture running 4 modules 2 for each also would offer some advantage. Hope that helps in your decision. But to kind of bottom line what he and I both have said. If you plan on using the 32 Bit version of WinXP I don’t know that you would really gain any thing with running 4 modules, but I would agree a slight advantage should be seen, at least theoretically. However, if your plan is to run Linux 32 or 64 Bit or the 64 Bit Version of Windows XP then I would go for 4 CM72SD512RLP-3200 modules as I think this would offer better over all usability. Link to comment Share on other sites More sharing options...
InclininWirefre Posted May 26, 2005 Author Share Posted May 26, 2005 gr8ly appreciated! Link to comment Share on other sites More sharing options...
Corsair Employees RAM GUY Posted May 26, 2005 Corsair Employees Share Posted May 26, 2005 No problem, and please let us know how you make out! Link to comment Share on other sites More sharing options...
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