Okay, I recently just bought a new laptop and I want to give my sister my old computer. BUT it has a PII slot CPU 400MHZ. I want to upgrade it to a HIGHER Slot CPU. I know PIII CPU's only go up too 1.4GHZ. But some of those are socket CPU's. Does anyone know what the highest Pentium Slot CPU I can get for my computer? Or if there is an adaptor from slot to socket? I want my sister to have this computer with a faster CPU but I dont want to change the mobo. Any help will be apprieciated.

Double check your board specs to see which CPUs it supports before ordering anything. Make sure to get the 100MHz FSB version. http://www.starmicro.net/SearchResu...

95% of the 100MHz FSB Slot 1 board's I've worked with all accepted P3/Celeron CPUs (though some of them required a BIOS update). The fastest Slot 1 cpu you can get is the Pentium III 1.0E GHz processor. If you go the P3 route, make sure that it has an E attached to the name. "E" means that it's a Coppermine P3 with a 100MHz FSB. "EB" means Coppermine with 133MHz FSB--avoid these, as your board won't be compatible (unless you overclock the chipset). The vast majority of 1GHz P3s are EBs, so be careful which one you're buying. Though these ones are quite rare, P3s with just a "B" attached to the name are Katmai P3s with 133MHz FSB--also avoid these. If you decide to get a slot to socket adaptor (a Slocket), then the fastest CPU you could install is the Celeron 1.4GHz. P3s above 1GHz all use a 133MHz bus, so you're forced to use a Celeron at this speed range. If you decide to get a Celeron instead of a P3, make sure that it's a Tualatin-core Celeron--these perform much better than "standard" Coppermine-128 Celerons. Also make sure that the Slocket is Tualatin-compatible. Pentium III--Descendant of Intel Core. Pentium III-S 1400 @ 1.63GHz, 512K L2 X800XT AIW OC 580/600 2GB of RAM 250GB HD SB Audigy 2 QDI Advance 12 mobo Smugly running Vista

"If" the thing won't go over a 500mhz cpu i'd just up the ram and put a newer quicker hard drive in it. 2kpro, 512mb ram, 80 gig IDE 7200 rpm would run fine on a 400mhz cpu. To get the full potential out of a 80 gig hd you may need a control card. mhz & ghz are over rated for general use machines like surfing the net. I have run in the past a old Gateway P2 500/512mb ram, 80 gig hd and it would do most anything inc. burn dvd's "not movies though". If she plans on editing pictures, audio, video, CAD, etc. then get as fast a cpu as you can fit or a mobo upgrade should be a must. MSI K8N Neo AMD Athlon 64 3200+ @ 2.21ghz 1GB DDR 3200 nVidia 128mb FX 5200 WD 120gb SE NEC ND-3500AG DVD R/RW