Texas Instruments TX486DLC/E-40GA clock doubling \ VOGONS

Texas Instruments TX486DLC/E-40GA clock doubling

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First post, by MercuryMaurader

Posted on 2026-02-24, 16:19

MercuryMaurader Offline

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Hello everyone,
I've been looking at upgrading the 386DX CPU inside my T5200 to a 486. I've done some research and found some potential upgrades. Besides the possibility of paying over $200 for some of the CPU upgrades, I found a TX486DLC/E-40GA at a decent price. According to some information I have found, some of the CPUs will run at 20MHz when installed into the T5200 but some will run at 40 MHz due to built-in clock doubling. I have no idea if this CPU has clock doubling built in. If it does not, I'd rather find out now then after I buy it.

I found some specs on this webpage but it doesn't give me much info otherwise.
https://thandor.net/object/800

For this interested, this CPU is listed on SpitFire-666's Github as an upgrade as well as others.
https://github.com/SpitFire-666/Toshiba-T5200 … =readme-ov-file

Thanks

"Speed alone cannot win the race" - Coach Potter

Reply 1 of 4, by Thandor

Posted on 2026-02-24, 21:32

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It does not have clock doubling. For clock doubling you should find CPU’s like Cyrix Cx486DRx2 or Texas Instruments TI486SXL2 😀.

thandor.net - hardware
And the rest of us would be carousing the aisles, stuffing baloney.

Reply 2 of 4, by fosterwj03

Posted on 2026-02-25, 13:51

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Can you upgrade the motherboard's clock crystal to 80MHz?

Reply 3 of 4, by MercuryMaurader

Posted on 2026-02-26, 04:12

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Thandor wrote on 2026-02-24, 21:32:

It does not have clock doubling. For clock doubling you should find CPU’s like Cyrix Cx486DRx2 or Texas Instruments TI486SXL2 😀.

I've done some more research and found the TI TX486SXLB-040-GA is a pretty good upgrade. It features clock doubling and is one of the better upgrade paths. The Cyrix processor you mentioned was the first one I looked at but the only one I found for sale was in Toyko Japan for over $190.

"Speed alone cannot win the race" - Coach Potter

Reply 4 of 4, by MercuryMaurader

Posted on 2026-02-26, 04:13

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fosterwj03 wrote on 2026-02-25, 13:51:

Can you upgrade the motherboard's clock crystal to 80MHz?

I haven't looked into that. I'm not good with soldering so I don't think this is a path I could go down.

"Speed alone cannot win the race" - Coach Potter

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