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bpd115
Sep 9, 2003, 11:25 AM
I was wondering if the new iMacs are using a new G4 or have they simply increased the FSB to 333 effectively overclocking the chip?

Assuming the chip had a 7.5 multiplier, the 133 fsb of the previous generation would give you 997.5 Mhz or ~ 1Ghz.

Keeping the same Multiplier of 7.5 and increasing the bus to 166 (333 DDR) you come out to 1245 Mhz or ~1.25.

Now if I could only find out how to increase the FSB of my Ghz iMac I'd be set :cP

AngryAngel
Sep 9, 2003, 12:02 PM
I believe the prvious top-end iMac had a FSB of 167 Mhz, and th 15" had 133MHz bus.

Now both have a 167Mhz bus. The bus multipliers are x6 and x7.5 (for 1 and 1.25 Ghz).

bpd115
Sep 9, 2003, 01:09 PM
I have the previous top of the line 1 Ghz 17inch. The ram is 266 (133 FSB) DDR (Although the G4 design only operates on an SDR bus, meaning 133.)..

illumin8
Sep 9, 2003, 01:44 PM
The real question is this: Is the new iMac using the Motorola 7457 processor, or just a Motorola 7455 processor that is overclocked to 1.25 ghz?

If they are using the 7457 processor, this bodes well for the near-term availability of new 15" and 17" PowerBooks based on the same logic board design. It also means that Motorola is probably finally able to deliver these processors in volume.

Dont Hurt Me
Sep 9, 2003, 02:16 PM
7455, which by the way there is nothing wrong with at higher clocks such as 1.25. i expect a 1.2 g5 in the next powerbook,heat and power are about the same as 1 gig g4. the 1.25 imac is a very solid machine in my opinion.

Lanbrown
Sep 9, 2003, 02:31 PM
Originally posted by Dont Hurt Me
7455, which by the way there is nothing wrong with at higher clocks such as 1.25. i expect a 1.2 g5 in the next powerbook,heat and power are about the same as 1 gig g4. the 1.25 imac is a very solid machine in my opinion.

The 7457 is better at equivalent clock speeds, it requires less power, generates less heat, has twice the cache and the bus is even faster.

bpd115
Sep 9, 2003, 03:19 PM
IF the powerbooks get a G5 in a few days I'll be selling a kidney to buy one (and then getting beat by my gf for not buying her an engagment ring yet...what can I say, it's a sickness!)

Dont Hurt Me
Sep 9, 2003, 03:32 PM
Originally posted by Lanbrown
The 7457 is better at equivalent clock speeds, it requires less power, generates less heat, has twice the cache and the bus is even faster. also isnt out yet.

Lanbrown
Sep 10, 2003, 09:19 AM
Originally posted by Dont Hurt Me
also isnt out yet.

Actually it is; the question is how about in volume though.