What are differences between 4th-gen i7 M and U processors?
I know about:
- core voltage
- TDP
- socket
- price
But is there something more? Some differences like slower cache, reduced instruction set?
Answer
So, for comparison - I took two 2-core Haswell i7 processors with... same numbers - 4600M and 4600U. It may be wrong, but I couldn't find pair of M and U processors with same cache and similar clocks.
U-series is very diffrent. It's not just M-series with lower core voltage.
- There is no PCI-express 3.0 support
- PCI-express (2.0) only in 4x1, 2x4 modes (no 1x16)
- USB and SATA controller is built-in
- diffrent memory controller (supports low-power memory)
- in some low-power devices with U-series CPU may slow down under long and heavy load (throttling, less Turbo etc.)
These are only few differences. There is a lot more, but my question seem to be not popular, so there is no reason to list them all.
My final verdict about performance differences between M and U series is:
U-series performance (per 1GHz) is same as M-series, but PCI-e limits may reduce system performance if you want to use GPU somehow (3d or as coprocessor).
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