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Temp diff. between 65nm and 45nm

post #1 of 2
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What are the temp differences with the 45nm CPU's? Obviously it depends on the speed and voltage settings, but whats the difference between comparably clocked 45nm and 65nm cpu's? Also, How much of a difference does the extra CACHE on the new 45nms make... I have a e4300 which has far less cache than a say e8200... If I were to run a e8200 at say 3.0ghz (the same as my e4300) how much of a performance increase would I see from the cache and other improvements?

Asus A53s
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Asus A53s
(6 items)
 
  
CPUGraphicsHard DriveOptical Drive
Core i5 2430M Nvidia GT540m Intel 320 SSD DVD-RW/CD-RW 
OSMonitor
Windows 7 64 bit 15" 1366x768 
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post #2 of 2
Hi there,

The new 45nm cpu's have new dielectric materials on the transistor gates (called high-k dielectric materials), this is the material that insulates the gates. This has the effect of reducing the leakage current in the processors.

The previous dielectric (silicon dioxide) was getting so thin (a couple of atoms!) as the feature sizes were getting smaller that the leakage was huge, so they needed more power to get the processors working.

The 45nm cpu's don't need that much power, due to much less leakage current so they should run noticeably cooler in general for similar processors at similar clocks.
This is only one example, but there are quite a few changes that help them run cooler.

One thing to look out for in the future is when they change the interconnects on the CPU's from copper to something else, we should see a big performance jump when that happens. Probably wont happen for a while though.
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