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Where does Atom rank against the Core 2 Duo and Athlon X2?

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October 27, 2008 12:24:08 AM

I was just wondering, at what GHz would a Core 2 Duo and an Athlon X2 have to be clocked down to in order to have nearly the same power?
October 27, 2008 12:44:20 AM

LOL interesting question.
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October 27, 2008 12:51:27 AM

Not sure, but a Celeron at 800MHz is about the same as an atom at 1.6GHz IIRC.
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October 27, 2008 2:20:52 AM

You'd need to take them to a clockspeed that you simply can't do with BIOS settings :lol: 
October 27, 2008 2:46:59 AM

Depends on the benchmark. (Starts talking "per cycle" like some fanboy.)
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October 27, 2008 11:10:39 AM

The Atom is simply a very low power CPU meant for use in mobile devices. They typically have very low clocks (I've seen 1.2 GHz Atoms) in comparison. I don't know their efficency per clock cycle, though.
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October 27, 2008 11:31:52 AM

ghmage said:
Depends on the benchmark. (Starts talking "per cycle" like some fanboy.)


Its an intel - its faster then any amd and more stable and doesnt explode... right? :lol: 

BETTER QUESTION - IS IT CLOCK FOR CLOCK FASTER THEN A PENTIUM 4
October 27, 2008 12:33:08 PM

Off the top of my head here so I'm probably wrong.

I've read that the 1.8ghz Atom is about the same as a 900mhz P3 in rough terms. That indicates that the Atom's instructions per cycle is half of a P3. A P3 does 2 (again off the top of my head, based on the P4 IPC since mhz for mhz they where similar). That would imply the Atom does 1 instruction per cycle. Core 2 65nm does 4 IPC and Core 2 45nm does 5 IPC. Effectively a Atom dual core @ 10ghz would rival a 2ghz Core 2 45nm....

Again, off the top of my head so please no being nasty...
Anonymous
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June 8, 2011 1:20:38 PM

JDocs said:
Off the top of my head here so I'm probably wrong.

I've read that the 1.8ghz Atom is about the same as a 900mhz P3 in rough terms. That indicates that the Atom's instructions per cycle is half of a P3. A P3 does 2 (again off the top of my head, based on the P4 IPC since mhz for mhz they where similar). That would imply the Atom does 1 instruction per cycle. Core 2 65nm does 4 IPC and Core 2 45nm does 5 IPC. Effectively a Atom dual core @ 10ghz would rival a 2ghz Core 2 45nm....

Again, off the top of my head so please no being nasty...


Correction A p3 like a p4 and does 3 instructions per clock, a p4 is 20% slower than a p3 per clock.
(I had a p3 Tualatin Celeron running 1.6 (and another one 1.8 for a short time) with a 33 to 36% overclock.
An Atom does either 1 or 2 per clock, I don't remember anyway this number does not directly give you the IPC (Performance per Clock) there are a lot more variables like pipeline depth, architectural differences, cache. cache speed, busspeed, etc etc

And this is just plain wrong: A Core 2 45nm does not have 5 IPC, a Core2 45nm does the same amount of instructions per clock as an 65 nm, the extra cache (and in rare cases the SSSE3 and SSE4_1) gives it a higher IPC but that is not a number like 4 and 5.

You are over simplifieing IPC and confusion it with I think pipeline width.

As long as there is no bandwith requirement like fast ram the P3 will outperform a slightly higher clocked p4 anyday.
(Of coarse with the later P4 with sse2 and sse3 and newer software the comparison gets trickeyer.)
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June 8, 2011 1:43:06 PM

I am sure the original single core atoms at 1.6GHz ran similar to a pentium 3 1-1.2GHz and here is a comparison to the dual core 4 thread D510 to a single core 2
GHz semperon LE-1150 http://www.anandtech.com/bench/Product/110?vs=44&i=2.5.... the results are up and down but I think the old semperon wins
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June 8, 2011 2:00:11 PM

If you took a crippled Conroe (read: Celeron) core and clocked it down to something like 500 - 600 MHZ, then maybe you could approximate an Atom's performance. I have an Atom NAS on XP and it's slow. Much slower than my old Core Duo setup at the same 1.6GHZ. It runs 'much' cooler, though. YMMV.
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June 8, 2011 2:48:18 PM

Master Exon said:
I was just wondering, at what GHz would a Core 2 Duo and an Athlon X2 have to be clocked down to in order to have nearly the same power?


Now be careful: By power, are you referring to performance as in speed, or actual power drain as in Wattage?
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