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Technology Stocks : Intel Corporation (INTC)
INTC 40.34-2.6%3:59 PM EST
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To: Noel who wrote (144588)10/5/2001 12:39:15 AM
From: Dan3  Read Replies (2) of 186894
 
Re: What's really mindboggling is the frequency at which this ALU will operate

And how little actual work it will do while churning that clock and sucking so many watts. One of 5 instructions is a branch, and going to main memory after a cache miss will cost several hundred CPU cycles! The data buss runs at 100MHZ (though it transfers at 4 times that, once the read instruction is acted on). The fastest RDRAM has a component latency of 40ns, in which time P4's "double pumped" unit doesn't do anything for 160 clocks. There are additional latencies from the bus handshaking, then it takes P4 28 clocks to decode and execute an instruction. A 3GHZ P4's "double pumped" unit does nothing but burn power for more than 240 clocks, plus bus latency plus decode and execute then finally it can output something, whenever a cache miss takes place.

Not much of a CPU, maybe, but a really great space heater!
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