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Mix and Match Memory - timing and voltage differences?

by iain010100 / April 20, 2008 2:23 AM PDT


I want to know if I can mix and match memory.

I have an ASUS PSW-5 DH Deluxe Motherboard (Intel Socket T (LGA775)) with 2 x OCZ PC2 8000 1 GB Dual CH Titanium Alpha VX2 4-4-4-15 (2.3V) memory. I just bought 2 x G.SKILL 2x1GB 240-Pin DDR2 SDRAM DDR2 800 (PC2 6400) 5-5-5-15 (1.8V - 2.0V).

Can these two memory types co-exist with differing timing and voltage requirements? When I set memory voltage in the bios I don't have a way of specifying the memory slots, so the setting applies to all chips, but there's also an "auto" setting. Will auto automatically provide the correct voltage for each of the two memory types?

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sorry for the repost.
by iain010100 / April 20, 2008 2:32 AM PDT

Sorry for the repost, cnet forums has dropped my post before, I thought it happened again this time.

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by At The Opera / April 20, 2008 2:37 AM PDT

I've never really paid attention to those things with any of my systems, and I've never had a problem just adding in RAM however. So long as it's the right "type" like in this case DDR2 800, I would expect it to work.

The new RAM has slightly higher latency timings, which can have an impact on games and high end AV apps, but it's probably more than offset by the increase in RAM.

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yes, but
by ramarc / April 20, 2008 4:01 AM PDT

your existing ram will slow down to match the speed of the new sticks. the new g.skill ram is ddr2-800 whereas your existing ocz ram is ddr2-1000. if you didn't manually configure the ocz ram for ddr2-1000 speeds, it's probably running at ddr2-800 already.

5-5-5-15 1.8v is the standard timing/voltage for ddr2-800. all of your memory has to run at the same timings and voltages, so you can either use the bios' "auto" setting or you'll have to twiddle with the timings/voltages to find what works best for you. you can probably reach ddr2-800 with 4-4-4-12 timings and 2.0v.

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