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Technology Stocks : Advanced Micro Devices - Moderated (AMD)

AMD 233.53

+4.5%

2:44 PM EST

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To: wbmw who wrote (236917)	7/23/2007 11:25:18 PM
From: pgerassi	Read Replies (2) of 275872

Dear Wbmw: Get your story straight. First you claimed that G965 was lower in idle power than G945 when it is shown here to be 17W more. Then its so good that it performs better than K8 because it Core 2 Duo. And yet here it both is slower and takes more energy than either 90nm Windsors or 65nm Brisbanes. BTW the 65nm Athlon 64 X2 4000+ is the very same chip as BE2350. The only difference was that it was in the 65W TDP bin. Yet the idle power is the same between the two. See here: lostcircuits.com And that was a 65W TDP 2.5GHz A64 X2 4800+ Brisbane (8.8W) to a 45W TDP 2.1GHz BE2350 Brisbane (8W). So 20W TDP and 20% more clock equals only 0.8W extra at the VRM input. At full power with two copies of Prime95 running, the same two have only a 10.6W difference at the VRM input or (35% higher). Much of that is likely to be the 20% faster clock which needs a higher voltage. Using a linear approximation from the idle power difference between X6800 to E6700 using (266MHz less clock equals 1.6W) * (2.67GHz - 1.8GHz) / (2.93GHz - 2.67GHz) = 5.4W from 20.4W is 15W. And that doesn't take into account the E4300's 800MHz FSB and half L2 cache both of which should lower idle power even further. It should be worth another 5W to 10W idle. The difference in idle power is down to 2W much less than the idle power shown in the 690G to G965 comparison. As far as Turion X2s not having a C3 state, this page begs to differ: prostarnotebook.com "In addition, a C3 ‘Deeper Sleep state feature has been added to the AMD Turion 64 X2 dual-core mobile technology family ..." Also it is in Tyler (the 65nm Turion X2 (currently TL-58 at 1.9GHz and TL-66 at 2.3GHz)). Of course Griffith will go much further allowing both cores to be completely off while the ODMC and NB still work. Pete

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