Quote:
Originally Posted by Quantum Reality
I'm surprised these CPUs tolerate such a highly out of spec HT link and NB speed. I've tried keeping mine closer to 2000 MHz just to avoid possible instability from that sector. How much of a difference does it make to performance to increase these values?
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I've always heard that a higher HT Link won't show any performance difference unless it's a drastic change (such as from 1000MHz to 2000MHz).
The CPU-NB clock is also the speed of the integrated memory controller. A couple hundred MHz or more increase in this value should boost memory bandwidth a little.
These latest AMD cpu's will overclock the crap outta the CPU-NB clock. I've got 2600MHz stable on this Athlon II 630, and I accomplished 2860MHz stable CPU-NB clock on the Phenom II X3 720. As a lot of these Athlon II's are locked Deneb cores, I would expect similar overclocks and performance gains from the uncore frequencies.
Also, most motherboards with AM3 support will natively run 2600MHz HT Link. So if your cpu can handle it the rest of the system should already have the headroom.
In summary, I would say play with the NB speed as much as you'd like until you reach a point of instability, but HT link isn't really worth much except bragging rights and the pleasure of seeing high clock speeds.
Edited by metal_gunjee - 11/10/09 at 11:56am