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600MHZ suddenly appeared?

Jamiman

Jamiman

Jamiman

Associate
Joined
16 Oct 2010
Posts
618
Location
Nottingham
Hi,

I've got an Athlon X4 640 @ 3.0GHZ i've been running at stock since i got it (tried an oc once, couldn't get past 3.1 without overvolting)

Now, i recently got a new mobo + extra 4GB RAM, so i'm now running 8GB.

I went into my BIOS this morning, and noticed my RAM was running at 800mhz, not the rated 1333!

So i changed the RAM frequency, and suddenly Windows says my CPU is running @ 3.6GHZ! with no overvolt!

Is this my system getting confused, or has my CPU suddenly decided it likes to work with a higher clock on my new mobo?

The thing that really has be confused is the fact my Idle temps are no different, and i'm on stock cooling....
 
Check your multiplyer is on a 1:1 ratio using CPU-Z. Increasing your memory clock also increases the FSB which in turn increases the core clock.
If it's running stable though, just keep it.
 
As far as I can tell for your CPU to be on a 1:1 ratio your memory needs to be set to 800MT/s or 400MHz.
Thus by increasing your memory from 800 to 1333MT/s you have increased the FSB from 200MHz (3.0GHz core) to 240MHz (3.6GHz core).

Because 200 x 15 (Multiplier) = 3.0GHz and 240 x 15 = 3.6GHz core clock.
Thus you have overclocked your CPU until your memory became stock. If it's stable while playing games etc, then I'd just keep it like that.

Your memory should now be running at 666.5MHz while your FSB is at 240MHz giving you an FSB: DRAM ratio of 3:1.
 
Well, BC2 was getting a few crashes, so i've put my memory back to how it was, removing the crashes.....So i guess it wasn't as stable as i first though :D
 
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