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March 21, 2006 10:31:10 PM

What is the difference between the AMD Athlon 4800+ and the AMD Socket 939 Opteron 180 Denmark? They both have the same operating speed, (2.4 GHz) the same size cache, are both dual-core, and are both socket 939 processors as well as 64-bit support. However, the Opteron is a bit over $700 while the 4800+ is $630. The only difference seems to be that the Opteron runs hotter and therefore doesn't overclock as high. Hmmm.... :arrow:

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March 21, 2006 10:38:34 PM

Quote:
The only difference seems to be that the Opteron runs hotter and therefore doesn't overclock as high. Hmmm..

I think you mean that the opty is rated for a higher TDP, so it can OC higher. That's because it is a higher binned chip.
March 21, 2006 10:39:43 PM

Quote:
only difference seems to be that the Opteron runs hotter and therefore doesn't overclock as high. Hmmm....


The opposite is true.
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March 22, 2006 4:50:24 PM

Quote:
The opposite is true.



I have heard that the Athlon 4800+ can overclock to 2.7GHz on stock cooling and never get above 50C while others with the Opteron can only get up to speeds of 2.6GHz at very high temps.
March 23, 2006 5:23:55 AM

In general opterons will oc higher than X2's

The fact is though there are lots of combinations and parts to an overclock, different batchs of cpus, different ram, motherboards etc etc so thats why some people can get x2s higher than optys.

Now if you took two identical setups with the best oc batch of opty and the best oc batch of X2 the opty would probably overclock higher.

Just my view, also most people rave about optys because in the begining they were cheaper than there X2 counter part but prices have now be raised.
March 23, 2006 8:27:53 AM

http://www.amdcompare.com/

- Strangely enough, not many AMD fanboys can read it for some reason. Often making up quotes in contradiction to that on official AMD websites, or techdocs, or whitepapers. :p 

- Bear in mind 'Wattage' and 'Thermal Power' are not the same thing, just AMD playing tricks on the dumb. :p 
March 23, 2006 8:53:30 AM

I've found that 2 same chips can have very different operating temperatures - and different stabilities (the hottest not necessarily being the less stable).

Frankly, nothing beats hand-picking your chip amongst a bunch you can test yourself...
March 23, 2006 1:08:20 PM

The only reason there would be more than a 5 watt heat output / power usage difference at a given load is that the die size is different, or you are comparing a substantially more advanced stepping / revision to an older one on the same die size (far less difference).

Another reason would be the mechanism cooling the CPU has worn, the thermal paste / pad has worn, isn't as even as the last CPU tested, etc.

As you can see on www.amdcompare.com a given processor may be available (although when they are not they get removed from the site, so it makes 'global' comparisons harder) made on totally different manufacturing processes (die size shrink).

The Opterons all used to be on 130nm, (vs 90nm of many of the Athlon 64's), and yet people praise the entire Opteron line regardless. (Even though it includes 3 major stepping changes, made over 2 different die sizes).

The real 'trick' is just knowing the exact stamp to look for on the CPU.

Check http://www.amdcompare.com and notice there are 7 different wattage varients for AMD desktop processors, and 11 different wattage varients for AMD server processors (All Opterons currently - Although many of those 11 are not available to consumers). With enough cooling it is possible to get near 4 GHz on particular models (Usually mid-upper clocked varients with low power consumption), Certain Opteron processors at 50 - 70 watts are likely to be the new Athlon XP-M of 2006, at least until Intel 'Core' Conroe is released (Which is expected to overclock well).
March 23, 2006 1:12:47 PM

Probably stepping/revision play a big role. It can also depend on the fab and batch.

However, you are right to point out those nuances - that does help.
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