486DX-33 Overdrive is a 486DX2-66?

[= a m z =]

I recently purchased a DFI 486-CCV motherboard with what was supposed to be
an Intel 486DX2-66 chip. Instead, the chip says Intel Overdrive
ODPR486DX-33. Additional writing: Q698 ES B1 C2291652. Underside has
more writing. It fits in a ZIF socket labeled Socket 1.

Here's the strange part: On boot-up, it says it is a 486DX2-66. CPUID can
only tell me it is 486DX or 486DX2. I ran a diagnostic program and it said
it was running at ~66.49MHz. The bench, however, shows up a bit *below*
what a 486DX2-66 is supposed to bench. I've checked the jumpers and can't
find anything that seems to be out of place. The board is supposedly
running at 33MHz, but can run up to 50MHz.

What is going on?
What is the fastest processor I can put in the slot?

Thank you in advance for your reply.
- AMZ

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[= a m z =]

I just found the answer to my question. Not on any of Intel's pages, but in
an old, obscure HP tech page.

Q. Why is the OverDrive chip labeled 33 MHz when it is really 66 MHz?

A. Intel labels the OverDrive chips with the external local bus speed they
support. Since all OverDrive chips have the "clock doubling" feature, it is
assumed by Intel that everyone knows that the CPU runs at twice the bus
speed internally. Note that the OEM version of these chips, the DX2, is
labeled with the actual CPU speed.

I must say that I love how the answer reads, "...it is *assumed* by Intel
that *everyone* knows..."

[Randy S.]

Thus explains the later marking of BOXDX2ODPR66

--
Randy S.
Intel Internet Technical Support
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