Gateway Overclock
I think overclocking on D815EEA mobo is possible. If your processor is 100fsb x 8 multiplier (P3-800MHz. ) then you could change the fsb to 133 x 8 = 1064MHz. If your processor is P3-800EB then forget oveclocking. I don't know how, except changing to overclockable mobo.
How do you overclock to 133fsb x 8 ?
1. You could cover or take out pin BSEL1 on processor's pin. As results, the processor is going 133fsb as default speed. Cover BSEL1 only. See attachment: BSEL.BMP for detail.
Tips: I prefer to cut the "copper line" on the back of mobo. Cut it with "acto knife" ( sharp pointed razor blade ).
2. You should increase Vcore to achieve stability. Check out Pentium3 S-Specs to determine which "stepping" of your processor (cB0, cC0, cD0, etc). From the S-Specs, you could also determine its default voltage. Read this article for better understanding: "Voltage MOD for PIII Motherboards - The Wire Trick" by Anders Petersen - 9/8/01 at Overclockers.Com.
Tips: I prefer to do "solder tricks" by attaching a single wire and soldered it on the back of mobo.
3. Replace the heatsink with the biggest heatsink you can afford. AMD heatsink is the best to reduce heat problems. It does fit on socket PGA370. If you aren't sure, just buy the biggest Intel PGA370 heatsinks.
4. Set BIOS at its "default" speed and boot up. Good Luck man!