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Mixed xms2 ddr 675 & 800 question

post #1 of 3
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xms2 3GBs "ddr 675 1GBx2" & "ddr 800 512x2"

okay im getting a 6750 and i know i can run it at stock speed with that ram mixed fine but when i start to overclock i will have to over clock and set timings for both mixed to work right ? so i want to know if its okay to mix ram like this when over clocking ? do i just have to find voltage and timings that works for both or what?
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post #2 of 3
Indeed, you will have to overclock the DDR2 667 sticks (the DDR2 800 sticks obviously have a bit of headroom).

At stock, the RAM runs 1:1 at DDR2 667 speeds (FSB = 1333 MHz).

Generally, overclocking is a bit limited when you mix RAM, but I do believe you can at least overclock the DDR2 675 kit to the stock speeds of the DDR2 800 kit. It's a matter of trial and error.

I would see how far you can get on 4-4-4-12 timings (I am assuming that this is the default timing of both the DDR2 675 kit and the DDR2 800 kit). If that doesn't work well, try 5-5-5-15. With a lot of luck, you *could* go beyond DDR2 800 speeds, but I don't expect much more (since you'll be hitting the limit of the DDR2 675 kit)

Regarding voltages, stay at stock at first. You probably need to overvolt a little to get the DDR2 675 kit to behave, but probably not heapes upon heaps.

Also, keep an eye on the temps of those sticks (by touch...). It might be a good idea to point a fan at them. I mean, four sticks in that kind of close area, and two of them overclocked... gets a little hot (I fried a few sticks recently, although I now strongly think my mobo is simply a RAM eater)
    
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E8400 @ 3.8 GHz DFI LANPARTY DK X38-T2R eVGA 8400GS 2GB Mushkin DDR2 800 (single stick) 
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250GB WD SATA None Windows XP Pro 32-bit HP Pavilion f1703 
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post #3 of 3
Thread Starter 
Thanks alot
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AMD FX 8120 [8 core] Gigabyte GA-970A-UD3 XFX Radeon 6850 Crucial 
Hard DriveOptical DriveOSMonitor
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AMD 8
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CPUMotherboardGraphicsRAM
AMD FX 8120 [8 core] Gigabyte GA-970A-UD3 XFX Radeon 6850 Crucial 
Hard DriveOptical DriveOSMonitor
Crucial SSD Asus DVD Burner Win 7 Asus 27" and 2 - 22" 
KeyboardPowerCaseMouse
Microsoft 650W Smilodon Microsoft 
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Focusrite Saffire PRO 14 
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