X58A-UD3R: memory settings change BCLK?

[Gary123]

I just noticed that when I changed the BIOS memory settings to go from the stock 1066 to 1600 (12x 8-8-8-24-T2 88 1.64v Vtt1.295v), BCLK changed from 135 to 133 (as reported both by the BIOS and by Memtest86+). I didn't change BCLK or any CPU settings, though, and BCLK Control is still shown as [DISABLED] in the BIOS.

So my naive question is: is it expected that boosting the memory speed has the side-effect of slightly reducing BCLK? The reduction is too small to mind; I'm just wondering what's going on.

[Gary123]

Looking into it a bit more, I see that 133 is apparently the stock BCLK speed for the i7-950. So the question is why BCLK was 135 under the BIOS Optimized Defaults, before I changed any memory settings. My guess would be that the BIOS tries by default to do some minor OCing, but if you change any timings manually (even just the memory timings), then everything else goes to stock speeds unless you set it otherwise. Does anyone know if that's indeed the correct explanation?

[oggmonster]

Pretty sure thats right, it just tries to get everything to match up.

Not tempted to do a bit of overclocking then?

[Gary123]

I wouldn't mind setting it back to 135, but I don't have time to learn if there are any other changes that I'd need to make, or that the BIOS might automatically make but shouldn't. I don't care much about the negligible reduction--was just curious about the reason for it.

[Lsdmeasap]

Stock is 133, Gigabyte often sets 134-135 as stock so they can be 1-2Mhz above the rest by default 

Not sure why changing the memory would set it back to actual stock value, but it's negligible anyway, you are fine with either.