Ok, as for what happened when I stuck it in, the laptop actually powered up and started to boot, but absolutely nothing showed on the screen. It didn't light up or anything, but I could see the HD light going and hear the normal boot up sounds. So, my guess is the signal was not going through the x1400 to the display since it wasn't recognized. What I should have done was hook up an external monitor and see if that worked, since the external monitor isn't directly hooked up to the video card. Not sure if that would have made any difference, but it might have(damn hindsight).
Anyway, you DO NOT want to flash a I6000 with the E1505 BIOS, the motherboards are completely different so nothing would work right except maybe the vid card! You really don't want to do that, the chance of you being able to go back and put your old BIOS on there would be slim to none. So you'd be buying a new MB. But anyone that knows how to hack a BIOS should be able to do this without too much trouble. I'd learn how to do it if I wasn't getting married in a month, I just don't have the time.
As far as the x1400 being a worthy upgrade or not, I say it most certainly is! Not only does the x1400 support alot more stuff like open GL 2.0, HDR, SM3, AVIVO and a few other small things but the clocks are MUCH higher. I mean stock to stock you're looking at a 500-600 point increase in 3DMark05! That's no small feat. The x1400 is an excellent gpu for the price, and I for one am very happy with mine. Considering that the price for the x1400 is actually less from spare parts than the upgrade is($95 from spare, $149 or $179 as an upgrade I believe) it's more than worth it, even for a E1505 owner with a x1300.
So, we need someone to step up here and get this BIOS hack going. Who is good at programming and will spend the time to do this? We need someone to help us out here! I seriously would do it but for the wedding. If it doesn't happen by mid-June then I will take it over and do it once I'm back from my honeymoon.
