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Following the footsteps of these gentlemen & crew: Trusty N64 Freak FriendTech I intend to upgrade the CPU in my Xbox, for Linux performance. At some point (after I have an SMD rework station) I intend to upgrade the RAM also. At this stage I'm just researching the feasibility, and seeing what I'm jumping into. I believe I can use a CPU socket (495) from a mobile Pentium 3 to use a P3 1 GHz "SL53s" with minor accommodations made. I will need to comb over the datasheets as I don't currently know If I can just "drop in" a faster 495 mobile celeron/P3, say after I've installed a CPU socket from an old laptop. Processors I've seen photos of installed in adapters include: SL5XL The Tualatin 1.4 GHz 512KB L2 Cache and 133MHz FSB SL53S Seen in N64 Freak's 1GHz mod, apparently using a cpu w/ 100MHz FSB is not out of the question. SL657 Seen in an adapter board somewhere. I wouldn't try an SL6BY because the core voltage is lower than 1.5V and the original CPU used up to 1.7V Some concerns I have: VID Voltage Range, VID[4:0] SSE Technology, SpeedStep Technology. GTL+ (do any of the cpus use the older GTL, if not then it is not a concern at the moment) Bus Speed: Can I use a chip with 100 MHz FSB? Nobody wants to downgrade.. L2 Cache: Does this matter? Can I simply use a chip with more, believe I can because Trusty & N64 freak have already done this without issue. To slow the CPU speed, they are apparently using STPCLK# assertion. This is accomplished on the adapter PCB with the necessary support components added. My first attempts will not include provisions to slow the performance, as playing games on the console will not be an immediate priority. I'll have to check the usual places and see if I can locate a CPU area schematic for the Xbox, I believe it is in the wild, if anyone has details, please PM me! The socket 370 to 495 adaptor shouldn't be too difficult to create seeing as how I have some datasheets to work from. First attempt I will use a standard 495 PGA mobile cpu (currently looking for one w/133 FSB) in a recovered 495 socket, then comes the task of designing an adapter board to go from 495 to 370. If N64 Freak would like to comment his words will be greatly appreciated, I'm not here to steal anyones thunder; just looking for a performance gain. I have datasheets from that era attached below, I'll have to see if the SL5sn (xbox) CPU is mentioned. Thanks everybody! =================== ---All The Best--- =================== -LeapFrogging ia-platform-basics-paper.pdf p3_ds_CPU_MOD.pdf moreCPUhere_28365403.pdf 29859603_CPU_MOD.pdf here_24530624.pdf III Processor 1400 512KB L2.pdf celeron.pdf KC80526LY500256SL4JP-Intel.pdf