Originally posted by: GuitarDaddy
Originally posted by: gobucks
Anyways, though, i'm still looking for that PCI lock. It's gotta be there somewhere, after all, it's listed in Asus's specs, and Asus is a pretty reputable company, so i'd imagine they aren't lying about it. I'm just afraid to use ntune until i can lock the PCI bus.
The PCI express clock is set independently in the Jumper free section of the bios. It comes set at default
100mhz and stays right there as you increase the FSB. I've run the FSB up to 290 (apparently the max for this board) and the PCIe clock stays at 100mhz. I think the nTune message is bogus, the nTune software was obviouly not written for boards with an independent PCIe bus.
One thing I've found about the overclocking options of this board that I don't like is the manual RAM options, or lack of. As you raise the FSB the board automatically applies a memory divider and forces the ram to run async. The maximum FSB that I've been able to run with RAM 1:1 is 246mhz. To get 246 I changed the memory clock option from auto to DDR466 and rebooted, the system comes up with FSB @ 233. Increase the FSB to 246 and it stays 1:1, raise to 247 and it applies the memory divider. I have heard mention of an A64 divider table? Do all A64 boards work this way? Are manual divider settings a thing of the past?
I think my next try will be to drop the multi, loosen the timings and set the mem clock to DDR500, boot to 250mhz and raise it from there.
I did the following test to show the difference running memory 1:1 vs async
prior to running the test I ran Prime95 1-2 hours with both settings
281 x 9.0 = 2529mhz
RAM 181 @ 2-2-2-5
3dmark05 2776
240 x 10.0 = 2400mhz
RAM 240 @ 2.5-3-3-10
3dmark05 3056
As you can see 3dmark05 which most consider mainly a GPU test loves memory speed.