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I could be mistaken, but the answer is Yes and No. As a dual core CPU, the CPU speed for the Athlon 3800 X2 is advertized as 2MHz, but as a dual core, you have 2 CPU's, and if each CPU is running at 1MHz, then 2*1MHz yields an effective speed of 2MHz. To use an analogy, it's a bit like comparing a $10 bill to two $5 bills -- in the latter case, the two bills have equal buying power to the single (larger) bill, and by the same token, for a given unit of time, two CPU's simultaneously operating at 1MHz have the same computing power as a single (faster) CPU running at 2MHz, at least in marketing-speak anyway.
I'll admit I don't know what the true results from /proc/cpuinfo should be for that CPU, but if they should be 2MHz, then could it be possible that your BIOS is underclocking the CPU? I'd kind of doubt that, seeing as how it is being recognized (correctly) as a 3800, but it's a possibility
A multi-core processor is not cumulative. If it saids it is clocked at 2 GHz, then both the cores will be clocked at 2 GHz. No it will not be 4 GHz and no processing power will not be increase.
You probably have Cool 'N Quiet enabled in the BIOS. If you turn it off, then you should see the the clock at 2 GHz. Though check if the settings in the BIOS is correct for your processor. If the processor was just been installed or its a new system build, the BIOS may sometimes under-clock.
Just a wild guess: could this be a kernel issue? If I understand correclty, the CPU was replaced but not the kernel - maybe it does not support dual cores?
Just a wild guess: could this be a kernel issue? If I understand correclty, the CPU was replaced but not the kernel - maybe the it does not support dual cores?
It shows two processors in the /proc/cpuinfo so he is running a SMP aware kernel already. To the OP as Electro has said you have Cool'N'Quiet enabled and the powernowd or one of the others daemon running so it slows down your processor and drops the voltage on the chip. My X2 3800 machine shows the same thing once you put the chip under load as lazlow mentions the speed and voltage jumps back to full levels.
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