Re: Why is not the northbridge circuitry a part of the cpu?

sndive@xxxxxxxxx wrote:
AMD CPUs have the memory controller in the CPU. Intel has yet to go
that route.

Is that why dual socket AMD motherboards suck?

No, that is why dual socket AMD motherboards usually outperforms dual
socket intel motherbords when you do memory benchmarks.

Most dual socket opteron motherboards have different memory banks for the
two CPUs. Most dual socket xeon motherboards let the two CPUs share the
same northbridge which becomes a bottleneck to RAM. Typical solutions look
like this:

AMD Opteron: RAM <- HT -> CPU <- HT -> CPU <- HT -> RAM
Each CPU has at least one hypertransport to a memory bank of its own and
also a hypertransport to the other CPU.

Intel Xeon: CPU -> Northbridge <- CPU
I
V
RAM

Both CPUs share the same northbridge and the same memory bus.

There are some really expensive motherboards for intel where each CPU has
its own norhtbridge and the cheapest dual socket opteron motherboards only
have a memory bank connected to one of the CPUs, but most motherboards are
constructed as described above. A good idea is to study the block diagram
describing a motherboard before bying it.

regards Henrik
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