Low Latency DDR2 800MHz versus 1,066MHz

October 27, 2008 | 07:02

Tags: #5 #3 #4 #800mhz #benchmark #better #cas #ddr2 #p45 #performance #result

Companies: #gskill #intel #test

Lavalys Everest Memory Performance

Website: Lavalys

Everest Memory Performance Test

  • DDR2 1,066MHz C5
  • G.SKill Pi-Black 4GB 1,015MHz C5
  • G.SKill Pi-Black 4GB 800MHz C4
  • DDR2 800MHz C5
    • 8439
    • 8419
    • 8408
    • 8178
    • 8522
    • 8468
    • 7134
    • 8492
    • 7832
    • 7088
    • 8374
    • 7905
0
1000
2000
3000
4000
5000
6000
7000
8000
9000
MB/s (higher is better)
  • Read (MB/s)
  • Write (MB/s)
  • Copy (MB/s)

Everest Memory Latency Test

  • DDR2 1,066MHz C5
  • G.SKill Pi-Black 4GB 1,015MHz C5
  • G.SKill Pi-Black 4GB 800MHz C4
  • DDR2 800MHz C5
  • 62.4
  • 62.8
  • 72.9
  • 73.6
0
10
20
30
40
50
60
70
80
Nanoseconds (lower is better)

The overclocked G.Skill Pi-Blacks nose near the 1,066MHz DDR2 but are only stable up to 1,015MHz on our Gigabyte P45 board. At the same memory timings of 5-5-5-15 the read and copy performance is marginally faster, but the read speed is lower. At its rated performance the Pi-Blacks at CAS-4 are only a little faster than CAS-5 memory and the read performance is largely lower compared to the 1,000+MHz DDR2, of which, the latencies are also a good 16 percent faster.

SiSoft Sandra Lite XII.2008.SP2c (14.24)

Website: SiSoftware

Unbuffered Memory Performance

Sisoft Sandra Unbuffered Memory Test

  • G.SKill Pi-Black 4GB 1,015MHz C5
  • DDR2 1,066MHz C5
  • DDR2 800MHz C5
  • G.SKill Pi-Black 4GB 800MHz C4
  • 8480.0
  • 8255.5
  • 7677.0
  • 7650.5
0
1000
2000
3000
4000
5000
6000
7000
8000
9000
MB/s (higher is better)

Memory Latency

Sisoft Sandra Random Memory Latency Test

  • DDR2 1,066MHz C5
  • G.SKill Pi-Black 4GB 1,015MHz C5
  • G.SKill Pi-Black 4GB 800MHz C4
  • DDR2 800MHz C5
  • 73.0
  • 76.0
  • 84.0
  • 88.0
0
10
20
30
40
50
60
70
80
90
Nanoseconds (lower is better)

Naturally the Pi-Blacks can quite keep up with the reference DDR2 1,066MHz when overclocked, and CAS-4 only knocks a few nanoseconds of its latency and doesn't do anything for the raw performance here.
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