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MacBook Pro i7 CPU Performance and Memory Speed

Last updated April 20, 2010 - Send Feedback

This page analyzes raw CPU performance.

See the system configuration notes.

MemoryTester — memory bandwidth

See MemoryTester for details on this test.

The memory controller of the Core i7 delivers up to 46% better bandwidth for multi-threaded code! This is a real test with threads(pthreads) in a real C++ program, not theory.

MemoryTester — compute

See MemoryTester for details on this test. The graphs below are for 1/2/3/4 CPU threads on the horizontal axis.

Even though memory itself is the same speed (1066MHz), the memory controller of the Core i7 delivers superior bandwidth.

ThunderBay 4 - The Speed To Create. The Capacity To Dream.

SHA1 hash (CPU task with memory access)

Hyperthreading (3 or 4 threads) delivers a small improvement here, but not much.

Copyright 2010 DIGLLOYD INC / Mac Performance Guide
MemoryTester compute command

Pure computation with no memory access

Hyperthreading (3 or 4 threads) delivers almost zero improvement.

Copyright 2010 DIGLLOYD INC / Mac Performance Guide
MemoryTester compute command

Pure memory access: copy and compare memory.

The memory controller of the Core i7 delivers up to 29% better bandwidth with two threads copying and comparing memory.

Hyperthreading (3 or 4 threads) achieves nothing, as expected.

Copyright 2010 DIGLLOYD INC / Mac Performance Guide
MemoryTester compute command
Cycling

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