KOG <[EMAIL PROTECTED]> In-Reply-To: <[EMAIL PROTECTED]> On Wednesday, Mar 12, 2003, at 13:15 Canada/Eastern, [EMAIL PROTECTED] wrote: Fellow Listers, Would anyone happen to know if a 225 MHz ASPD 604e Processor Card from an Apple clone, specificly a UMAX S900, work in a Powermac 7300? Thanks, Cautionary Craig W.
and KOG replied: This is a good question. I bought a Umax 250Mhz card on ebay and paid a premium for it. I just tried it the other night and low and behold this 250 Mhz card shows up as a 200 Mhz one. I contacted the vendor and they are sending me another one. If that one doesn't go any faster than the last one they gave me, I'll give up on non G3 or better upgrade cards. KOG ----------------- you should be aware that bus speed limits the maximum processor speed you can acheive with trying for a G3 upgrade. only macs with bus speeds of 50 can get full use out of processor upgrade chips clocked at multiples of 50. if your bus speed is 40, you are not gonna be able to get the full maximum speed implied in the chip's name. example: my 6360 runs at a bus speed of 40Mhz. the best i can hope for out of a G3 chip is 8 times the bus speed, or 8 x 40 = 320Mhz. knowing this, when I went looking at G3 upgrades, I looked at 300Mhz, 350 Mhz, and 400Mhz cards. i eliminated the 300's because they couldn't hit that 320 max. I eliminated the 350's because I didn't have a bus of 50, and 350 is a multiple of 50. that left the 400's, which i ended up purchasing from sonnett thru OWC. looking at your numbers, 200Mhz is both a multiple of 40 [times 5] and 50 [times 4] so it should work for buses of either speed. but if your machine has a bus speed that is not 50Mhz, you aren't going to get that max of 250Mhz potential that the chip CAN do, not in a 40Mhz bus machine. It would, if you were putting it on a 50Mhz motherboard bus. I beleive all the PCI macs that end in x500 have 50Mhz bus speeds.[ the 6500, 7500, 8500, 9500] It will give you the maximum multiple of up to eight times the bus speed, that it can do, up to the chip's limit. If the bus is 40Mhz, multiply 40 times a whole number from 1 to 8, until you hit the chip's max, or short of it: 40, 80, 120, 160, 200, 240. the next jump of 40 would put you at 280, which is more than the chip is rated for. so 240 is your maximum benefit on a 40 Mhz bus., regardless of what the package advertises the chip to go at. if your bus is different Mhz, do the math accordingly. if it were 25Mhz: 25, 50, 75, 100 125, 150, 175, 200 that's 8 times the bus speed. maximum increase, 200Mhz, tops. even if the package says the chip goes at 250Mhz. not in a 25Mhz bus, it can't. if you moved it into a 50 Mhz bus machine, it WOULD go at 250 Mhz. so the guys you bought it from might be perfectly honest, and the chip probably DOES do 250Mhz, but only on a 50 Mhz bus. the problem might be your bus speed. it can't be upgraded and you can't get any more acceleration out of it. 8 times the bus speed is all you can get, regardless of what the chip can reach. janet -- PCI-PowerMacs is sponsored by <http://lowendmac.com/> and... Small Dog Electronics http://www.smalldog.com | Refurbished Drives | -- Sonnet & PowerLogix Upgrades - start at $169 | & CDRWs on Sale! | Support Low End Mac <http://lowendmac.com/lists/support.html> PCI-PowerMacs list info: <http://lowendmac.com/lists/pci-powermacs.shtml> --> AOL users, remove "mailto:"; Send list messages to: <mailto:[EMAIL PROTECTED]> To unsubscribe, email: <mailto:[EMAIL PROTECTED]> For digest mode, email: <mailto:[EMAIL PROTECTED]> Subscription questions: <mailto:[EMAIL PROTECTED]> Archive:<http://www.mail-archive.com/pci-powermacs%40mail.maclaunch.com/> Using a Mac? Free email & more at Applelinks! http://www.applelinks.com
