I think the P4 only does 3 instructions per clock cycle, and the athlon 9, however in most circumstances the athlon is only capable of doing 6, and the P4 only one. In actual performance, athlon 64s do about 1, athlon xps a bit less, and p4s a bit less than that. I think the main thing that limits it is memory and cache performance, thus why the Pentium M's efficient cache helps a lot, and why the athlon 64's integrated memory controller helps a lot.
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AMD vs Intel
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Aenslead
Golden Member
People here (most... almost 98%) like AMD because it has the best price-performance-technology ratio. You cannot go wrong with AMD; the recent release of the X2 processors has shown that AMD is the performance leader in everything.
Cheaper, better, faster, newer, cooler, and accepted by savy community! You cannot go wrong.
The P4 has 2 integer units and 2 floating-point units, along with 2 AGUs, giving a total of 6 execution units.
'Double-pumping' of the ALUs was proven necessary to compete with the integer performance of the P!!!.
The Athlon (K7 & K8) has 3 integer and 3 floating-point units, with 3 AGUs, giving a total of 9 execution units.
It can thus be described as 50% wider than the P4, and is able to execute 50% more instructions per clock, theoretically.
As you say, it is difficult to keep those execution units full all the time, but the situation isn't quite that bad.
The K8 introduced a 'pick' stage into the Athlon's pipeline that analyses code for dependencies and reschedules instructions accordingly, allowing the Athlon to acheive IPC closer to its theoretical maximum (which, incidently, is the reason for adding larger caches).
Hmmm.,... and a 1ghz P4 Oc is like a 650mhz A64 OC........I have seenn many 3000+ getting to 2.4-2.5ghz....if we look at the 3.71ghz stable comment a 710mhz P4 OC is like a 450mhz A64 OC...Now that is getting easier and can be done by most chips with stock vcore (3000+ and 3200+'s)....
Though I do agree no venice short of 3500+ and not even so much there as much as the 3800+ have been getting to 2.8ghz.....I have seen like a few 3200+'s do it but by no means average or persumable.....
They overclcok higher because there a high frequency design, the athlon isnt. But since when did we compare cpu's from Intel and AMD clock for clock ?. 1 Ghz on a P4 is roughly the same as 650 Mhz overclock on an athlon 64, so it needs to be a higher overclocker if its to keep up.
Bluechulappa
Junior Member
Okay guys this is my first post on this forum butI want to build a computer! I've been looking at Intel processors and AMD processors endlessly and can't figure something out. So an AMD 64bit 3000+ = 1.8ghz but is it really 3.4ghz? I don't understand how AMD has these processor that say are slower than intels but they can't be cause they are the same thing. So basiclly do you double the speed when your thinking about AMD since AMD 64 are twice the intle 32bits?
I'm building a gaming rig but I don't want to spend to much.
Is a AMD 64 3000+ enough power? I read it's only 1.8 ghz but does that translate into 3.0ghz?
I'm building a gaming rig but I don't want to spend to much.
Is a AMD 64 3000+ enough power? I read it's only 1.8 ghz but does that translate into 3.0ghz?
imported_brandon
Member
It's hard to put in Lamens terms, but yes, a 1.8Ghz Atlhon64 3000+ is equivalent to a 3Ghz P4, except in games, where it crushes almost all of the P4s.
Kevlar Coated Tent
Member
First of all i will say everyone knows that AMDs are faster for desktop processors in almost all apps, but what you are all overlooking is the fact that a simple Pentium M clocked @ 2.56 GHz will beat the FX55 and the Pentium 6xx processors in all 3D games and some other applications while using a lot less power than either AMD or Intel chips. Also with Yonah intel has said that there will be less leakage even though they are going to be using a 65nm process. One can only hope that the P4s (if they are still alive) will beifit from the lower leakage intel has managed on the 65nm processor and go faster (and hopefulyl get better architecture).
Bluechulappa, 32 vs 64 bit has nothing to do with it; the reason why an athlon64 @ 1.8 ghz can compete with (or beat, depending on application) a pentium4 @ 3.0, is the CPU's design. (and this is all in 32 bit applications. ) basically, an athlon64's ghz get more work done per clock than the pentium 4's.
both amd and intel now have CPU's with 64 bit extensions that will give some boosts when using 64 bit software on a 64 bit OS but right now it makes little difference due to the lack of 64 bit software.
GuitarDaddy
Lifer
ANY AMD style chip overclocked to FX55 clockspeed will beat a stock FX55 because of the much higher memory speed. So what!, any of the skt939 chips can do this. Overclock the FX55 and it will stomp that little mobile chip.
Hell, my SD3700+ (the lowest speed rated San Diego, two steps below the FX) will seriously take the Pentium-M to the woodshed. Show me a Pentium-M with anything close to these Sandra CPU scores.
My 3700+ Sandra Scores
Hell, my SD3700+ (the lowest speed rated San Diego, two steps below the FX) will seriously take the Pentium-M to the woodshed. Show me a Pentium-M with anything close to these Sandra CPU scores.
My 3700+ Sandra Scores
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