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creat 1236
On Tue, 04 Jan 05 13:04:20 GMT As I see it the cigarette lighter device has HDL (Hardware Definition Language) that says (for exampe) PDP 10 and HSL (Hardware...

keith easier instructions to

I don't think INTEL made the same trade-off at all, they had a far better process and about 2 orders of magnitude more transistors to burn for staters. I don't think 21064's trade off was "foolish" either, they were faced with Hobson's choice.

21064 : short pipeline, high clock. Very simple core. P4 : long pipeline, extremely high clock. 2 orders of magnitude more transistors, --ing huge core stuffed chock full of clever OoO stuff.

Dumb!

I don't think that's true. Intel's approach is quite simple, up the number of transistors on a die and use the new transistors for cache. By and large I think the cache-expansion thing is the simplest and most efficient way of upping performance. It is a neat trick because caches can exploit redundancy relatively easily compared to a CPU core, and that can be used to improve yield dramatically. It also gives the marketing wankers a really simple way to come up with new products.

As for architecture Intel placed it's size 15 plates on both sides of the "speed demon-brainiac" fence. 1) Itanic = slow clock, lots of FUs, "simple" scheduling logic, huge cache. 2) P4 = fast clock, complex scheduling logic, not so huge cache.

Alpha 21064 0.7 um, 3 L, CMOS 1,680,000 transistors 300 MHZ 431 PGA

PowerPC 601 0.6 um, 4 L, CMOS 2,800,000 transistors 80 MHz 304 PGA

Note that the PPC601 is *NOT* POWER, it was a 32bit chip vs Alpha's 64bits AND it had far more transistors, ran at a far lower clock and it was fabbed on a significantly more advanced process (note the 3L vs 4L as well as the slight feature size edge).

The 601 was not in the Alpha's league in terms of grunt either.

Data Entry 1238
You just pressed a key, didn't you? How do you learn to use that camcorder, by throwing bones on...

Yup.

Cheers, Rupert


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