macahill Posted February 17, 2008 Share Posted February 17, 2008 Not sure I have a problem, but my system only ever detects 3.5Gb of memory when I have 4xCorsair XMS DDR2 1g sticks installed. I realize from other posts I've read here that I needed to drop the speed of the DRAM from 800Mhz to 667Mhz . . .which I've done, and ran Memtest CD for 4 passes with out error. System is stable as well, just pondering where the other 1/2GB of ram went to :biggrin: BIOS reports 4096MB installed, and 3583MB usable(this is what vista detects also-3583MB). I thought I remember reading somewhere that each SLI slot used takes up 256MB system memory, which would put me exactly where I am. I just want to make certain I'm not missing anything BIOS settings: Memory Timing SLI-Ready Memory: High Performance (Optimal and Disabled work and pass Memtest as well) tCL: 4 tRCD: 4 tRP: 4 tRAS: 12 Width of DRAM Interface: 64-bit 1T/2T Memory Timing: 2T Channel A Clock Skew: Normal Channel B Clock Skew: Normal DDR2 Voltage Control: 2.1v Advanced Memory Settings tRC: Auto tWR: Auto tRRD: Auto tRWT: Auto tWTR: Auto tRTP: Auto tWRRD: Auto tWRWR: Auto tRDRD: Auto tREF: Auto tRFC: Auto DRAM Termination: Auto Max Async Latency: Auto R/W Que Bypass: Auto Dynamic Idle Cycle Counter: Auto Idle Cycle Limit: Auto DCQ Bypass Maximum: Auto DRAM Burst Length: 8 (QW) - 64bit Dram Bank Interleaving: Enabled Memory Hole Remapping: Enabled all else set to Auto Also to note, the 9600 Phenom runs at 2.3Ghz, but I run it stable @ 2.6Ghz(226x11.5=2.599). Only option in Bios is to change the DEC, the option to change the multiplier is grayed out, so I can't run at anything other than x11.5 multiplier. If I'm missing something here please let me know, or let me know all my settings are as they should be. thanks in advance! Link to comment Share on other sites More sharing options...
Wired Posted February 17, 2008 Share Posted February 17, 2008 Looks correct. Link to comment Share on other sites More sharing options...
Corsair Employees RAM GUY Posted February 19, 2008 Corsair Employees Share Posted February 19, 2008 If you are using the 32 Bit version of Vista that is correct but if you have the 64 Bit version there should be a setting to remap the memory for a different O.S. Link to comment Share on other sites More sharing options...
macahill Posted February 23, 2008 Author Share Posted February 23, 2008 Yes, I'm running Vista Ultimate x64. The only setting I see that is close to anything like that is in the boot settings menu: OS Select for DRAM >64MB Options are [OS2] and [non OS2] I have it set to non OS2 Is this what you mean? Link to comment Share on other sites More sharing options...
DerekT Posted February 23, 2008 Share Posted February 23, 2008 Is this what you mean? No, that is not the feature. Download the MS Vista Patch http://www.microsoft.com/downloads/details.aspx?FamilyId=91672C7C-614B-404C-850C-377541E93C18 and run it. There will be a MS fix in the Service Pack to show the exact system memory, not the system memory available. Link to comment Share on other sites More sharing options...
macahill Posted February 23, 2008 Author Share Posted February 23, 2008 I already have that KB installed. It still shows 3582MB available in Vista. The Bios reports: 4096MB installed, and 3582MB usable Everything running well, and fast, just seems I should have the full 4GB available? Link to comment Share on other sites More sharing options...
DerekT Posted February 23, 2008 Share Posted February 23, 2008 This is an OS problem. You might wish to contact Microsoft with it but I have heard that the SP release for VISTA will correct this issue. Since the BIOS reports correctly you can be certain that the hardware of board chipset and memory are correctly working. Link to comment Share on other sites More sharing options...
macahill Posted February 23, 2008 Author Share Posted February 23, 2008 thanks, I'm not gonna sweat it then. Hopefully SP1 will fix it next month. Link to comment Share on other sites More sharing options...
Corsair Employees RAM GUY Posted February 25, 2008 Corsair Employees Share Posted February 25, 2008 Change it to OS2 and see what happens! Link to comment Share on other sites More sharing options...
Garvin Posted February 26, 2008 Share Posted February 26, 2008 non-OS2 is the correct setting when using Window's operating systems. The OS2 BIOS setting is a holdover from the IBM OS/2 operating system days. Link to comment Share on other sites More sharing options...
Corsair Employees RAM GUY Posted February 27, 2008 Corsair Employees Share Posted February 27, 2008 Yes but OS2 was developed by Microsoft and is more like Windows 2000 or XP in its code. Just please try it some MB's that was the way it had to be set. Link to comment Share on other sites More sharing options...
macahill Posted February 27, 2008 Author Share Posted February 27, 2008 Ok, I changed it to OS2, and notice no difference. Memtest ran successfully, and the bios & Vista still shows 3582MB of memory. Link to comment Share on other sites More sharing options...
Corsair Employees RAM GUY Posted February 27, 2008 Corsair Employees Share Posted February 27, 2008 I would contact the MB maker and see what they suggest. And have you tried loading setup defaults and resetting the memory settings? Link to comment Share on other sites More sharing options...
macahill Posted February 28, 2008 Author Share Posted February 28, 2008 yes, I started with setup defaults. I'll have to see what Asus has to say. thanks for the help. Link to comment Share on other sites More sharing options...
Corsair Employees RAM GUY Posted February 28, 2008 Corsair Employees Share Posted February 28, 2008 Please let us know! Link to comment Share on other sites More sharing options...
macahill Posted March 18, 2008 Author Share Posted March 18, 2008 After loading bios v1001 and Vista SP 1 my system now detects the full 4GB, both in the bios, and in Vista. I did have bios v906 running for a bout a week, but it made do difference. Unfortunately I did not check between updates so, I'm not sure which one did the trick or if it was the combo. In any event my system is stable, and running faster than ever. thanks once again for all the help! Link to comment Share on other sites More sharing options...
Corsair Employees RAM GUY Posted March 18, 2008 Corsair Employees Share Posted March 18, 2008 Great news and thank you for letting us know! Link to comment Share on other sites More sharing options...
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