KR7A-133 multiplier/divider anomalies???

[mluckey]

I recently tested my KR7A-133 at 17x, 18x, multipliers, with only unlocking the CPU voltage on the CPU, with a T-Bred B, AIUHB XP-2100+.

What is stranger still, is that 15x, 15.5x, 16x, and 16.5x and 20x are also available, but only if you set the Divider to 3:2:1 ratio, and the FSB to the 100 range. Granted, this kills the RAM bandwidth, but allows alot of mulitplier choices that aren't supossedly supported.

Is there a reason why the change in divider ratio and FSB range would unlock certain multis? I was also wondering if anyone else had tried to edit the bios to allow this to occur at 133 Mhz for the extra bandwidth boost.

[saaya]

try wcpredit , but i dont know of a setting that could change this...

weird problem. could be because of the bios or because of the pll... why do you want to use those high multis anyways?

[mluckey]

The reason that I like the high multi is to get the maximum mhz from the CPU. This CPU easily hits 2.43 Ghz on air cooling, but the chipset craps out at atound 177 Mhz FSB if I use super tight memory timings. Loosening the timings loses speed, and to regain the speed, I need around 185 Mhz FSB, but at that level I have to run at AGP 2x, so once again I lose speed in games. I've found a sweet spot at around 174 Mhz FSB with ultra tight memory timings, and CPU fast command set to fast. The issue is that the CPU is just loafing along at only 13x multiplier.

I could just buy a newer board, but where's the fun in that?

Thanks for the info on the program. I'll download a copy and try to see what's going on.

[sjohnson]

Looks like another project for one of my kr7a :)

Still the most fun board I've owned. High hopes for the DFI Infinity coming soon, though!

[mluckey]

Update:

I just found that after manually setting my AIUHB 0302 XP-2100+ to 13.5x multiplier, that I can now use 13x, 13.5x, and 14x all from BIOS, without reconfiguring the CPU via painting or cutting.

The setting of 9.0x, 9.5x and 10x multiplier equates to 13x, 13.5x, and 14x respectively. I'm curious if this is a result of manually changing the stock CPU multi, or would ANY 13.5x CPU be able to do the same? It's kind of nice to be at 2.33 Ghz at only 166 Mhz FSB for video processing, and then drop the multiplier and raise the FSB for gaming. It's like a new motherboard CPU combo!

If anyone has a 13.5x multiplier set on their CPU, could you check to see if it works on your board, or is it just a quirk on my CPU/mobo?