What is the fastest CPU for a T40 and looking to buy one (2024)

It supports the same CPUs as the T42 I think.
The only issue (for all T4x's except the T43) are:

Pentium Ms, not P4's obviously.
No 533, only 400.
No C0 stepping (7x5a instead of 7x5), as you'll have to mess around for them to work properly.

The fastest is 2.1ghz, but it's horribly expensive (150-200). So people aim at 1.8/2.0 which end up around 60. There's also someone selling a 1.6ghz for $22 on this forum.

1.5 Banias to 1.8 Dothan was the exact switch I did on my T40. There was a very large increase in performance with anything video related, whether it be viewing or editing. Well worth the money.

I also noticed a decrease in CPU temp too, but that might be because I redid my thermal grease with AS5 at the same time.

There is a slight difference in performance between 1.8 and 2.0/2.1...but:

2.1 will be very hot in a 14" cage.

2.0 will be cooler and I guarantee that you (or anyone else for that fact) won't be able to tell the difference.

1.8 is probably the best combination of price, reliability and performance. And, it's heaven and earth when compared with 1.5 Banias that you're running now.

If you need all the power you can get you're better off with a different board and 533Mhz FSB...but my guess is that you'll be OK with 1.8 on a T40 board.

Just my $0.02

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ajkula66 wrote:There is a slight difference in performance between 1.8 and 2.0/2.1...but:

2.1 will be very hot in a 14" cage.

2.0 will be cooler and I guarantee that you (or anyone else for that fact) won't be able to tell the difference.

1.8 is probably the best combination of price, reliability and performance. And, it's heaven and earth when compared with 1.5 Banias that you're running now.

If you need all the power you can get you're better off with a different board and 533Mhz FSB...but my guess is that you'll be OK with 1.8 on a T40 board.

Just my $0.02

Agreed on all of this, but just for the record the Long Fan of the T4x can cool the 765 (2.1GHz). Ran a 765 for 1 year w/ this and it was great.

You can also use NHC to reduce the voltages and gain a LOT of control over the thermals.

Check your local craigslist. I managed to snag a brand new P-M 735 (1.73GHz) for $65 for my Mini PC. It was the boxed version too. These bargains can happen.

If you can't find anything cheap enough I have a 1.7GHz Dothan I can sell for $45 shipped.

ajkula66 wrote:
If you need all the power you can get you're better off with a different board and 533Mhz FSB...but my guess is that you'll be OK with 1.8 on a T40 board.

An extra advantage would be the higher grade GPU, which for video editing would always come in handy. Not that I do much of it myself though...