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PIII voltages?

C

computer

Platinum Member
Guys, I cannot find any info on this @ Intel's website. It seems they always have several CPU's of the same speed and style, but with different voltages. They have NOTHING on slot one cpu's, only socket 370 (PPGA, FCPGA, etc). I can only find the datasheet for socket 370 cpu's, and that is senseless too. It states in the first table they can be from 1.3v to 2.05v, then in the other table that lists the cpu's from 500 to 1.13ghz, it says there only 1.6v to 1.75v! Can anyone tell me please, what the voltages are of SLOT ONE PIII CPU's? A datasheet would be great. I need to find out if there is a such thing as a 2.0v PIII (faster than PIII 450-500). There must be, because I have slot one mobo's here that state they support PIII to 800mhz, yet none will boot with a socket 370 PIIIe. Not even with a slocket adapter set to 2.0v! So, I don't get it. They must only support 'un-slocketed' PIII's which of course would be slot one, and they would have to be 2.0v.
Thanks. 😕
 
Katami Slot 1's were 2.0 V. These are the older .20u off die 512k 1/2 speed cacheCPU's. Slot1 and FC-PGA Coppermines are from 1.6 - 1.75 Vcore, .18u 256k on die full speed cache CPUs. For a Coppmine to work in your mobo, it must be either a slot 1 version, or a FC-PGA compatable slocket adapter must be used. Setting the voltage to 2.0V is not the correct voltage for one. What is the motherboard you are working with?
 
Yeah, that I knew 🙂 but what is the fastest 2.0v slot one? Looks like it might be 600mhz, but that can't be right since the mobo's say PIII to 800. There are several mobo's, Eupa IBB (440BX), Epox BX6, BX5, (both 440BX) 6VBA2, (via pro 133) etc. and all the manuals state PIII to 800mhz (or higher). The Eupa won't boot with a 600e (FCPGA 1.65v) even set to 2.0v, nor will it boot with a celeron 566 (FCPGA 1.7v) set to 2.0v. Board works fine with other cpu's (both sock 370 & slot one). The epox's won't be in till this week. (I'm trying to the fastest cpu for my dad's board which is currently the IBB). The slockets I tried are adj voltage and work with CU's on other mobo's. May I'll try another slocket....thanks. 🙂
 
Slot 1 Pentium III 450MHz, 500, 533B, 550 are 2.0 volts (all Katmai processors)

Slot 1 Pentium III 600MHz and 600B MHz are 2.05 volts (Katmai processors)

Pentium III 500E, 550E (cA2 stepping), 1.60 volts (Coppermine)

Pentium III 533EB, 550E (cB0 stepping), 600E, 600EB, 650, 667, 700, 733, 750, 800, 850, 866, except cC0 and cD0 stepping, are 1.65 volts.

All processors above 866 are cC0 or cD0 stepping, with voltages 1.70 and 1.75 volts respectively.

Check the notes for each processor on the Pentium III S-Spec Information Page.
 
"Old fart" (that sounds so demeaning 🙂 ) thanks for the "push" in the right direction. I tried another slocket and the 566 cel & 600e are booting fine now. Voltage seems a bit high for the 600e (shows 1.71v in the BIOS and it's a 1.65v core) but it is booting. Andy, thanks for that info, I can use it. I'll save that for future use. Thanks guys! 😀
 
I wouldn't worry about 1.65 Vs 1.7. If you were @ 2.0, that would be a problem. I dont know why I picked that name. I'm not all that old and dont smell so bad 😛.
 


<< 😀 I'm probably one fo the oldest dudes here.........I probably shouldn't say it, but I'm 41. >>


huh, you don't look a day older than 21! 😀
 
I think I read (Intel Developer site) that the upper limit for a Cu core is 2.0X volts (something like 2.05 or 2.07). Basically the vcore rating is X +/- Y and 2.00 volts should be within the +/- part.
 
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