Well, it didn’t work. There was too much of a speed mismatch and I’ve been seeing a lot of instability including an all out lockup. So back to Fry’s for another pair of the TwinX 1024-3200C2 modules. Now everything’s the same speed, though I did have to manually set the DRAM timings in the BIOS. But Corsair’s got a good forum whith excellent advice, so if you’ve got their memory and need some help, head over to www.asktheramguy.com for help.