What is the best Core and memory speed setting for the geforce 2 MX 400?

I set mine into 215mhz core 175mhz memory.

I had a blue orb installed on top of the OEM
heat sink, I attached it using a DEVCON Plastic steel epoxy..

can it take more?
or will it give up and burn?

Please Help me..
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[System Info]
Amd Duron 850mhz
KT133
ASUS A7V-E
320 MB Ram
40g Seagate Barracuda
Geforce 2 MX 400 64MB (28.32)
[215mhz core /175mhz memory] w/ blue orb
50x ASUS CD-ROM
230w Power Supply
56K modem
Windows ME
DirectX 8