Intel Core i7 Memory Performance

January 26, 2009 | 10:11

Tags: #benchmarks #channel #compare #comparison #controller #core #ddr3 #dual #i7 #integrated #performance #single #testing #triple #x58

Companies: #corsair #intel

IMC Performance

Lavalys Everest 4.60.1540 Beta Memory Performance

Website: Lavalys

IMC: Everest Memory Read Test

  • CPU Uncore Clock: 2133MHz
  • CPU Uncore Clock: 2667MHz
  • CPU Uncore Clock: 2933MHz
  • CPU Uncore Clock: 3200MHz
  • 11758
  • 13525
  • 13453
  • 14797
0
2500
5000
7500
10000
12500
15000
MB/s (higher is better)

IMC: Everest Memory Write Test

  • CPU Uncore Clock: 2133MHz
  • CPU Uncore Clock: 2667MHz
  • CPU Uncore Clock: 2933MHz
  • CPU Uncore Clock: 3200MHz
  • 9696
  • 11968
  • 12850
  • 13829
0
2500
5000
7500
10000
12500
15000
MB/s (higher is better)

IMC: Everest Memory Copy Test

  • CPU Uncore Clock: 2133MHz
  • CPU Uncore Clock: 2667MHz
  • CPU Uncore Clock: 2933MHz
  • CPU Uncore Clock: 3200MHz
  • 14649
  • 17333
  • 18689
  • 19335
0
5000
10000
15000
20000
MB/s (higher is better)

IMC: Everest Memory Latency Test

  • CPU Uncore Clock: 2133MHz
  • CPU Uncore Clock: 2667MHz
  • CPU Uncore Clock: 2933MHz
  • CPU Uncore Clock: 3200MHz
  • 45.4
  • 41.7
  • 40.5
  • 39.1
0
10
20
30
40
50
Nanoseconds (lower is better)

The read performance hit a little bit of a bump at 2.67GHz to 2.93GHz, but improves again at 3.2GHz - Everest was consistent in reporting this and we can allude it's possibly due to core-uncore ratio changes, perhaps: 1:1.23 works better than 1:1.1. Overall though there are significant increases all round, although even though memory controller frequency elevation does give it a lower latency, as we saw previously, optimising the memory timings works out better in that equation.

L3 Cache Performance


IMC: CPU L3 Cache Read Test

Everest 4.60 beta

  • CPU Uncore Clock: 2133MHz
  • CPU Uncore Clock: 2667MHz
  • CPU Uncore Clock: 2933MHz
  • CPU Uncore Clock: 3200MHz
  • 24778.0
  • 24932.0
  • 25343.0
  • 24912.0
0
5000
10000
15000
20000
25000
MB/s (higher is better)

IMC: CPU L3 Cache Write Test

Everest 4.60 beta

  • CPU Uncore Clock: 2133MHz
  • CPU Uncore Clock: 2667MHz
  • CPU Uncore Clock: 2933MHz
  • CPU Uncore Clock: 3200MHz
  • 15313.0
  • 18032.0
  • 19028.0
  • 20236.0
0
5000
10000
15000
20000
MB/s (higher is better)

IMC: CPU L3 Cache Copy Test

Everest 4.60 beta

  • CPU Uncore Clock: 2133MHz
  • CPU Uncore Clock: 2667MHz
  • CPU Uncore Clock: 2933MHz
  • CPU Uncore Clock: 3200MHz
  • 23667.0
  • 24958.0
  • 25428.0
  • 25753.0
0
5000
10000
15000
20000
25000
MB/s (higher is better)

IMC: CPU L3 Cache Latency Test

Everest 4.60 beta

  • CPU Uncore Clock: 2133MHz
  • CPU Uncore Clock: 2667MHz
  • CPU Uncore Clock: 2933MHz
  • CPU Uncore Clock: 3200MHz
  • 4.1
  • 4.0
  • 4.3
  • 3.9
0
1
2
3
4
MB/s (higher is better)

Just to confirm our theory above - the latency of a 2.93GHz CPU Uncore gave us a consistently 0.3ns higher latency than 2.67GHz, indicating the other three are slightly more optimised for Core-Uncore data transfer. Increasing the Uncore frequency helps L3 cache writes hugely - by over 32 percent - but it does little for copy performance and even less for read.
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