Originally Posted by Draco
ok, many people have told me go with AMD , but I dont see why, am I over-seeing somthing? I mean as far as I know they both use the same princaples , I know AMD chips are better for overclocking but, can the ability to increase the muliplier make the difference when the stock EE has a clockspeed of 3.2 compared to the Opyerons 2.4?
note: sorry didnt know weather to put this in the Intel CPU subforum or AMD
That's exactly the problem really, they don't
work on exactly the same principle. In the simplest terms I can put it, an AMD Athlon (or Opteron since it's basically the same) is capable of doing more operations each clock cycle, each hert (MHz being million cycles per second). The exact numbers are 9 and 6, the Intel Netburst architecture (P4, PD, Xeon, etc.) doing six floating point operations each clock cycle and the AMD K7/K8 architecture (Athlon, Athlon XP, Athlon 64, Opteron, etc.) doing nine floating point operations each clock cycle. Floating point operations being the primary calculation used in gaming, where the Athlon shines. Simple numerical conversions as such can give a relative idea of performance. A 3.4GHz Pentium D in the case of your 840 EE (dual core also, but I'll get to that) is roughly equivical to an Athlon or Opteron running at about 2.3GHz. How'd I get that? Intel clock speed times 6 (floating point operations each clock cycle by Intel) divided by nine (floating point operations each clock cycle by AMD). It's rough, very basic, and shouldn't be taken too literal, but does explain why a significantly lower clocked Athlon can keep up, or even in a lot of cases, exceed the higher-clocked Intel. Now, on the dual core note, the 840 EE you're looking at has two physical processors inside it running at 3.4GHz each, and each of the processors therein running a logical processor capable of about 50% of the physical processor in multithreaded applications. It's unfair to compare that chip to an Opteron 150 (2.4GHz) because the Opteron is single core. A better comparison would be against an Opteron 180 which is a dual core Opteron with both cores running at 2.4GHz.
In the end, it depends on what you do, the 840 EE will probably have a lead in heavy multi-tasking and multithreaded applications due to its Hyper-Threading (I'd have to see benchmarks to confirm this though as the dual core Athlons have pretty much abolished all previous notions of Intel for multitasking, AMD for gaming, the AMD multicore processors are keeping up and even beating the Intels). The AMD however will more than likely excell in gaming performance.
The AMD also has its own little advantage to gaming, as Enterprise pointed out, the 3DNow! instruction extension which allows video card driver instructions priority access, which helps boost gaming a good bit.