2 x 512 MB DDR400 in FIS2R Slots 1 and 3, Performance Loss?

Hello,
I'm starting to make progress with the RAM I'm using (with Mushkin's help ---and to their credit they've been very helpful over the phone). One thing I've noticed is that running 1x512 seems to run stably regardless of which of the 2 DIMMs I use ---so the RAM doesn't _appear_ to be faulty. But I can _not_ run stably with 2x512 in slot 1 and 2. I can, however, run stably (it seems so far) with 2 x 512 in slots 1 and 3.
My question is, am I losing something by doing this? I seem to recall reading somewhere that performance was diminished by placing the RAM in this (1 & 3) configuration. Thanks in advance for any input.
Dave

Hi Jocko. Thanks for another fine reply.
Okay, I think I got the right settings now. I had "spread spectrum" enabled. Disabling that seems to allow me to run stably with 2x512 in slots 1 and 2 (instead of skipping the slot and having them in 1 and 3).
There were some other settings I needed to make sure were enabled, mostly in my sig.
The RAM is running at 2-2-2 and memtest hasn't shown any errors, but it hasn't run for too long yet.
I'll post my results back here tomorrow.
Thanks again and cheers.

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