Nisitiiapi Posted March 10, 2009 Share Posted March 10, 2009 I have a computer with an ASUS M3A78 board (not Pro or anything else, just plain M3A78) and Phenom 9950 BE's. I purchased the TWIN2X1024-8500C5D (ver. 1.5) because Corsair listed it as compatible with the M3A78. However, I cannot get the memory to pass stability tests at 1066 for the life of me. I have the latest BIOS from ASUS (was 0901, now have tried 1001) These are the settings I have tried: CPU/HT Clock: 200MHz PCIE Clock: 100MHz Process Multi: 13.0 VCore: +50mv (setting to Auto does not help) CPU-NB Voltage: +50mv (setting to Auto does not help) Processor Voltage +50mv (setting to Auto does not help) Process-NB Voltage +50mv (setting to Auto does not help) HT Speed: 2.0GHz HT Width: 16 bit GART Error Reporting: Disabled Microcode Updation: Disabled (Enabled does not help) Secure Virtual Machine: Disabled Cool 'n' Quiet: Disabled CPU Prefetching: Enabled C1E Configuration: Disabled Memory Value: 533MHz CAS: 5 (6 does not help) TRCD: 6 (5 not stable) TRP: 6 (5 not stable) tRTP: 3-5 TRAS: 18 (24 does not help) TRC: 30 tWR: 6 TRRD: 7 tWTR: 5 tRFC0-3: 127.5ns VDIMM: 2.10 (2.15 and 2.20 do not help, 2.0 maybe makes it worse) Bank Interleaving: Auto Channel Interleaving: Disabled (have tried all other settings, but no help) MemClk Tristate: Disabled Memory Hole Remapping: Enabled DCT Unganged Mode: Auto/Ganged (Unganged does not help) Power Down Enable: Disabled ECC Configuration: Disabled Alternate VID: Auto Legacy USB Support: Disabled (for testing purposes, as I have read here) Those are pretty much all of the settings I have available on this mobo. I know the CPU will run at DDR 1066. I had it in another system with an M3A32-MVP and it ran at 1066 better than 800. I have 3 systems all with this issue and the same specs (except one has an Athlon X2 7750). They all have this problem. So, I'm very certain not all 3 sets of memory are bad or all mobos, etc. It seems that it must be a setting. I was able to get a stable test on one computer at one point, but copying the settings to the other two has not made a difference. Is there a setting I'm missing to get these running stable? Any help would be greatly appreciated. I'm not sure these boards are capable of overclocking to an FSB of 266 (and using 800 as the divider), so I would rather not try to achieve "stock" settings on the RAM by overclocking the FSB. Was there any settings noted in the original compatibility testing? Link to comment Share on other sites More sharing options...
DerekT Posted March 10, 2009 Share Posted March 10, 2009 Just because the CPU memory controller can make 1066 does not mean you will make the same speed with another board. You have done all the necessary changes and if you still can not make the 1066 grade, then you are very likely not going to find that speed. I would set to 800Mhz with 4-4-4-10 and 2.1v. This is just as fast as 1066 with 5-5-5-15 anyway. I have a computer with an ASUS M3A78 board (not Pro or anything else, just plain M3A78) and Phenom 9950 BE's. I purchased the TWIN2X1024-8500C5D (ver. 1.5) because Corsair listed it as compatible with the M3A78. However, I cannot get the memory to pass stability tests at 1066 for the life of me. I have the latest BIOS from ASUS (was 0901, now have tried 1001) These are the settings I have tried: CPU/HT Clock: 200MHz PCIE Clock: 100MHz Process Multi: 13.0 VCore: +50mv (setting to Auto does not help) CPU-NB Voltage: +50mv (setting to Auto does not help) Processor Voltage +50mv (setting to Auto does not help) Process-NB Voltage +50mv (setting to Auto does not help) HT Speed: 2.0GHz HT Width: 16 bit GART Error Reporting: Disabled Microcode Updation: Disabled (Enabled does not help) Secure Virtual Machine: Disabled Cool 'n' Quiet: Disabled CPU Prefetching: Enabled C1E Configuration: Disabled Memory Value: 533MHz CAS: 5 (6 does not help) TRCD: 6 (5 not stable) TRP: 6 (5 not stable) tRTP: 3-5 TRAS: 18 (24 does not help) TRC: 30 tWR: 6 TRRD: 7 tWTR: 5 tRFC0-3: 127.5ns VDIMM: 2.10 (2.15 and 2.20 do not help, 2.0 maybe makes it worse) Bank Interleaving: Auto Channel Interleaving: Disabled (have tried all other settings, but no help) MemClk Tristate: Disabled Memory Hole Remapping: Enabled DCT Unganged Mode: Auto/Ganged (Unganged does not help) Power Down Enable: Disabled ECC Configuration: Disabled Alternate VID: Auto Legacy USB Support: Disabled (for testing purposes, as I have read here) Those are pretty much all of the settings I have available on this mobo. I know the CPU will run at DDR 1066. I had it in another system with an M3A32-MVP and it ran at 1066 better than 800. I have 3 systems all with this issue and the same specs (except one has an Athlon X2 7750). They all have this problem. So, I'm very certain not all 3 sets of memory are bad or all mobos, etc. It seems that it must be a setting. I was able to get a stable test on one computer at one point, but copying the settings to the other two has not made a difference. Is there a setting I'm missing to get these running stable? Any help would be greatly appreciated. I'm not sure these boards are capable of overclocking to an FSB of 266 (and using 800 as the divider), so I would rather not try to achieve "stock" settings on the RAM by overclocking the FSB. Was there any settings noted in the original compatibility testing? Link to comment Share on other sites More sharing options...
Nisitiiapi Posted March 10, 2009 Author Share Posted March 10, 2009 I agree being o.k. on one board does not mean it will be on another. However, Corsair lists these modules as compatible with the M3A78, so I would expect they have been tested to work on the board. I did discover that the system I had stable is no longer stable. I tried a different set of memory because I was able to get it stable on the 7750 system and thought I should try the same on one of the 9950 systems. I must have changed a setting somewhere to lose the stability (I had primed for over 90 hours without error). I may need to mess with some settings and see what I can do. I originally found Channel Interleaving at Disabled seemed key, but there must be another one. Still, if anyone has any suggestions on a setting, I'm glad to try it. In terms of performance, I may try your suggestion of tighter timings and DDR2-800, though I would prefer that in unganged mode, if I can get that stable. UPDATE: I may have spoke too soon. I have Prime95 running on one of the 9950 systems and it is still going after about 8 hours. I was having problems with HyperPi crashing earlier today (I usually use it as an initial test). So, perhaps I am o.k. If Prime95 is still running on the 9950 system in the morning, I will try P95 on the 7750 system tomorrow and see what I get. Link to comment Share on other sites More sharing options...
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