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A64 X2 3800 35W tested

post #1 of 8
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Quote:
Originally Posted by THG
With its total system power consumption of 54 W idle and 79 W at maximum load, the Athlon 64 X2 3800+ Energy Efficient Small Form Factor CPU lives up to its efficiency claims. The same platform, however, also drew less than 100 W at maximum load using the standard Athlon 64 X2 3800+. When discussing total system power consumption, it's important to remember that it includes chipset, graphics, RAM and hard drive power, and even the 15-25% power typically wasted by the power supply during conversion.
Two things became overwhelmingly obvious during this test: AMD's power savings extend from enhanced versions to standard Athlon 64 X2 cores, and that platform efficiency (mostly chipset and graphics) is the key to keeping overall power consumption at manageable levels. High efficiency will allow smaller enclosures for portable PCs and low noise cooling in home theaters, without resorting to typically high-priced mobile components or low-performance down market processors.
Intel's release of Core 2 may have stolen AMD's performance-per-clock thunder, but AMD retains its advantage in performance-per-watt when including the platform.
More here
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post #2 of 8
LOL. Ugh, when do they stop. You just lower the damn voltage and bam, energy efficient. BTW, for an equivalent power core 2, that would use less watts than the AMD.
post #3 of 8
Quote:
Originally Posted by Pwnjohnson
LOL. Ugh, when do they stop. You just lower the damn voltage and bam, energy efficient. BTW, for an equivalent power core 2, that would use less watts than the AMD.
The processor, sure, but not the chipsets and everything else required to make a system.

Just be happy that AMD still has a tiny niche there. More money for AMD means more research, quicker release of products, and then all prices will drop.
     
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post #4 of 8
Quote:
Originally Posted by Pwnjohnson
LOL. Ugh, when do they stop. You just lower the damn voltage and bam, energy efficient. BTW, for an equivalent power core 2, that would use less watts than the AMD.
And? Intel has done this on 65nm, AMD on 90nm.
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post #5 of 8
Quote:
Originally Posted by Pwnjohnson
LOL. Ugh, when do they stop. You just lower the damn voltage and bam, energy efficient. BTW, for an equivalent power core 2, that would use less watts than the AMD.
It's not just as simple as lowering the voltage to get these chips. These are made from a slightly tweaked manufacturing process from the regular A64s and are built with maximum power efficiency and minimum gate leakage in mind, which explains why these actually don't OC as nicely as the other X2 3800 EE. It's basically a Turion in a AM2 package.
    
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post #6 of 8
I honestly could care less about power consumption. Heck, I have an X1900XT

Im interested in speed more that effeciency. And unless its a budget build, the 3800+ is, well umm, kinda slow.
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post #7 of 8
Quote:
Originally Posted by HrnyGoat
I honestly could care less about power consumption. Heck, I have an X1900XT

Im interested in speed more that effeciency. And unless its a budget build, the 3800+ is, well umm, kinda slow.

overclocked to 3Ghz, it'll spank your 640...so I don't see the problem...lol. Lots of people have got them that high.
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post #8 of 8
Quote:
Originally Posted by Sideburns
overclocked to 3Ghz, it'll spank your 640...so I don't see the problem...lol. Lots of people have got them that high.
My 640 is old, outdated and absurdly power hungry. But thats not the point I was trying to make. Compared to a Core 2 Duo, a 3800+ is not that fast. Indeed, the 3800EE would be useful in a small form factor setup where power and heat are critical. However, in the world of overclocking, its nothing to get real excited about, since the low-leakage gates cannot switch as quickly as normal gates, thus it is unlikely that a 3800EE would OC as far as a regular 3800+.

Dont get me wrong, low-leakage gates are a good thing, but when it comes to overclocking, its better to stick with higher speed gates, despite an increased level of leakage. That is why Prescott was so power hungry. It used high-speed gates. As a consequence, it had a very high level of current leakage in the gates. However, this allowed it to hit 7+GHz on LN2 and capture several records at the time, including Super Pie. It was just something that the A64 could not scale up to, due to a more energy efficient gate design. Although under normal conditions, the A64's lower TDP allowed to scale to higher performance levels.

Now though, Intel has revised its design and made a much more efficient CPU that does much more work per clock. The switch to 65nm and a new architecture has allowed Intel to keep using these high-speed gates with a much lower consequence. That is why Core 2 CPUs will use a little more power than a comparable A64 EE, but overclock so well.

So if AMD wants to go for power efficiency, thats great, but their gonna have to not forget the enthusiast crowd.
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