I experienced the idea controller in weird state in several occasions too.
I think your best option is for active cooling of the cpu, but if you are comfy with 180mhz and no further effort - totally get you.

I think over 200 you will need hard peltier 12v cooling and that will require massive insulation to prevent condensation. Can be a cool experiment but without space tech applied it will be a techbench experiment, even the rest of the system can take it. I ran 2x80 and while cool, it requires significant wait states which compromises the point.

I happened upon a QFP Am5x86 that runs well in Windows NT4/w9x at only 3.15 V and 180 MHz with heatsink/fan. If I gradually lower the voltage, it crashes at about 2.9 V. This testbed is using an M919 v3.4, 1024K cache module, 64 MB TSOP EDO memory, Matrox G200, YMF719-E based sound card, and 3C509B ethernet. Timings at 2-1-2 and 0/0 ws. For 0/0 ws and 64 MB, an 8 ns SRAM module was needed, otherwise I must use 1/0 ws for 10-12 ns modules.

The curious part of the experiment is that switching to an ARK1000VL VLB graphics card ruins everything. With the ARK installed, it cannot run at 180 MHz, even with adding wait-states or increasing the voltage up to 4.4 V. The same CPU runs fine at 180 MHz on other systems w/G200.

200 MHz is not stable, but as you noted in the thread earlier, this may just be the motherboard and not the CPU.

I am using two 8 GB CF cards and I cannot soft reset at any frequency.

pshipkov, I am curious if you run your M919 with identical hardware, do you also witness a roadblock with the ARK1000VL at 180 MHz [in Win9x]?

180 at 3.15V and air cooling?
sweet!

I still didn't test the M919. Heading for another weeklong business trip, so hobby will have to wait some more. This is an interesting subject, so i will follow through here.