Originally posted by: sidneyb
If all the components were same or equal(1 Gig Ram, fast disk, fast video card,....), how much faster would a computer with the Opteron 165 dual core be than my existing P4 2.4 Ghz?
This is not really an easy question to answer, so bear with me for a while. I own a 165, and with current software, it does not often use both cores at once. It is hard to predict when software designed to take advantage of dual cores will change this.
Another problem is that AMD CPUs emphasize architecture over CPU speed. Your CPU runs at 2.4Gigahertz. Only the most expensive AMDs run that fast.
Generally, AMD assigns a 4 digit number to its CPUs (though not to the Opteron family) and that number gives AMDs estimate of how it compares in performance to an Intel chip. An AMD 2400+ should slightly outperform your 2.4G P4.
An Opteron 165 contains two processors each operating at 1.8Ghz. The closest single chip comparison I can find is the AMD Athlon 64 2800+, which also operates at 1.8Ghz. This chip will clearly outperform your 2.4 P4, but not by an enormous margin. I do not know how much having a second chip adds to that margin using current software.
All this leaves out an important point, however. With the right equipment, the Opteron 165 is insanely easy to overclock. My setup includes a DFI NF4 UT LANParty Ultra D mobo with 2 x 512Mb of Geil ONE RAM. I've achieved stable overclocks of 300 x 9, or 2.7Ghz. By stable, I mean I ran Prime95 on BOTH cores for over nine hours. By comparison, the AMD Athlon64 Dual Core 4600+ and 4800+ both operate at 2.4Ghz.
So, my Opteron 165 will OC to noticeably faster than a 4800+ running at its stock speed (as an aside, I do not know how much a 4800+ will OC, but I will bet it is nowhere near the 50% OC I got from my 165).
Not every 165 will OC to 2.7, and I dialed mine back to a fraction under 2.5Ghz due to noise and heat issues. With the right mobo, power supply and good RAM (so-called Value RAM is not the overclocker's friend), an Opteron 165 will go fairly easily to 2.4Ghz or more.
Of course, none of this really answers your question, as I do not know how well your 2.4 will OC. Neither do I know if you even have any interest in overclocking.
I hope this gives you at least some clue of how a 165 compares to your P4.