Fingers Posted November 8, 2008 Share Posted November 8, 2008 I have a P5N-E SLI m/b and have recently replaced my CM2X1024-6400C4 modules with some TWIN2X4096-6400C4DHX modules. I am only running two DIMMS/slots so I don't have to muck around with the issues that arise with 4 slots filled. I left my timings as they were for the previous modules (4-4-4-12 2t 2.178v) which was they only way to get the previous modules to run at the correct speed. All is good and stable, no issues to report except that CPU-Z v1.48 reports the memory as CM2X2048-8500C5D modules. Is this simply an error in CPU-Z and/or my m/b or do I need to change the timings to something else? Like I said, I am not having problems but I want to be sure. What timings/voltages should I be running for a P5N-E SLI & TWIN2X4096-C6400C4DHX memory? Link to comment Share on other sites More sharing options...
DerekT Posted November 8, 2008 Share Posted November 8, 2008 Please post the CPU-z Memory and SPD tabs. Please post both modules SPD tabs. Link to comment Share on other sites More sharing options...
Fingers Posted November 8, 2008 Author Share Posted November 8, 2008 Here you go. The BIOS settings are set manually (unlinked) to: tCL 4 tRCD 4 tRP 4 tRAS 12 Command Rate 2T Memory voltage 2.178v Everything else auto. Link to comment Share on other sites More sharing options...
DerekT Posted November 9, 2008 Share Posted November 9, 2008 Either you have been given 8500C5 (1066Mhz) DRAM for 6400C4 (800Mhz) DRAM or you have sticks where the SPD (Information of the DRAM) is misprinted. The "Max Bandwidth" is correct for either module as that is the JEDEC Max Bandwidth. However, the part number and EPP Profile is showing the 1066Mhz DRAM. So, you can set to 1066Mhz and 5-5-5-15 2T with 2.1v and Memtest for stability. If you are stable with 1066Mhz, then you have received the higher rated DRAM for the lower rated price. If they don't work, then it is a SPD mistype. It doesn't matter at any rate as it will continue to function as the correct part at 6400C4 speeds. Your speed and timings are correct for 6400C4 which is 4-4-4-12 2T 2.1v. Link to comment Share on other sites More sharing options...
Fingers Posted November 9, 2008 Author Share Posted November 9, 2008 Would it help to find out if I posted the numbers on the DIMM's themselves (e.g. revision)? If they were 8500 DIMM's with incorrect markings, would the numbers on the DIMM's be wrong as well? Is it likely that they are the higher speed DIMM's wrongly labelled and packaged? Weird... Link to comment Share on other sites More sharing options...
DerekT Posted November 9, 2008 Share Posted November 9, 2008 Would it help to find out if I posted the numbers on the DIMM's themselves (e.g. revision)? If they were 8500 DIMM's with incorrect markings, would the numbers on the DIMM's be wrong as well? Is it likely that they are the higher speed DIMM's wrongly labelled and packaged? Weird... You will need to test them to see. Set your DRAM to 1066Mhz, your timings to 5-5-5-15 2T and 2.1v. If they pass Memtest, then they are 1066Mhz DRAM. Link to comment Share on other sites More sharing options...
Fingers Posted November 9, 2008 Author Share Posted November 9, 2008 I can't get the memory to run at 1066mhz, it won't post, the highest I seem to be able to go is 1000mhz or so. After some research, this is a common problem with this motherboard. I really can't be arsed with all the overclocking crap. all I wish is that I had got what I had ordered and paid for. Funnily enough, it can't be an issue with CPUZ misreporting the RAM as the NVidia control panel reports the same part number (CM2X2048-8500C5D). Is this the same as TWINX RAM? Going by the Corsair memory configurator, this part number isn't even listed for my m/b. I'm going to run the RAM at 800mhz as it seems to be the best stability for this particular (crap) motherboard. To run the RAM at 800mhz, should I just use the settings below? tCL 5 tRDC 5 tRP 5 tRAS 18 tRC 23 Command Rate 2T voltage 1.8v If I get any problems with it, I will just RMA it and save the hassle. As a final check, should I post the part number and revision nuber from the DIMM's themselves to clarify exactly what has happened here? Could it be a mislabelled batch or the wrong DIMM's in the packaging? Link to comment Share on other sites More sharing options...
007bont Posted November 9, 2008 Share Posted November 9, 2008 if you want to run @ 800, you may want to try these settings, as they will give some extra perfomance when running at 800. tCL 4 tRDC 4 tRP 4 tRAS 12 tRC auto Command Rate 2T voltage 2.1 volt again, run memtest first after setting these values. if the above combination doesnt work for you, set it to 5-5-5-15 and yes, please post the numbers you may have on the module label and packaging, im sure RG want to have a look at it. Link to comment Share on other sites More sharing options...
Fingers Posted November 9, 2008 Author Share Posted November 9, 2008 Okay, all set and tested at 800mhz, no problems or issues, running fine. Here are the CPUZ screenshots showing this and I have included the CPU and mainboard screens to show CPU type and BIOS details (latest ASUS BIOS v1301) for information. Pictures of the DIMM's themselves will be in next post shortly. Link to comment Share on other sites More sharing options...
Fingers Posted November 9, 2008 Author Share Posted November 9, 2008 Pictures of DIMM's showing part numbers and revision details. Also the supplier stickers on the other side. Any information as to this weird situation would be appreciated. Of course, it could all be down to the latest ASUS BIOS being the culprit but I cannot come across anything on the web that hints to this being the case (e.g. others having the same problem). Many thanks for all your help. Link to comment Share on other sites More sharing options...
007bont Posted November 9, 2008 Share Posted November 9, 2008 Good to see that your running stable now. And thanks for uploading the pics, im sure Ramguy will answer it asap for you. Link to comment Share on other sites More sharing options...
Fingers Posted November 10, 2008 Author Share Posted November 10, 2008 Thanks. My system was always stable, the problem (?) has been the misreporting of the DIMM model. Either my BIOS doesn't read the DIMM info correctly or I have been sold some CM2X2048-8500C5D DIMMS that are labelled CM2X2048-6400C4DHX. Hopefully Ramguy can shed some light on this. Link to comment Share on other sites More sharing options...
DerekT Posted November 10, 2008 Share Posted November 10, 2008 Sheesh. You have better DRAM than you paid for. Forwarded to RAM GUY for consideration. Link to comment Share on other sites More sharing options...
Corsair Employee RAM GUY Posted November 10, 2008 Corsair Employee Share Posted November 10, 2008 Some times they will down bin a faster part if they are short on one speed grade and as long as the system is stable just set the tested settings mnaually and you should be fine. Link to comment Share on other sites More sharing options...
Fingers Posted November 10, 2008 Author Share Posted November 10, 2008 Thanks for the response(s) everyone. Shame I can't use the faster speed without a decent motherboard...:sigh!: Things are stable (running 3 VM sessions at the moment) so all is well. Thanks again. Link to comment Share on other sites More sharing options...
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