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Qimonda DDR2-800 4GB Memory Modules

Does higher capacity have a negative effect on performance?

September 23, 2008



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Test results

Testbed configuration

  • CPU: AMD Phenom 9750 (Socket AM2+), 2.4 GHz (200x12), B3 stepping
  • Chipset: AMD 790FX
  • Motherboard: ASUS M3A32-MVP Deluxe, BIOS v.1201
  • OS: Windows XP SP2 x64.

We used the most logical SPD mode, recommended by the manufacturer, as the nominal mode (DDR2-800, 5-5-5-18). Tests were run in two modes of the Phenom memory controller: ganged (higher performance in single-thread access mode) and unganged (preferable for multi-threaded applications that actively access memory). We also evaluated overclocking potential of these modules, even though we couldn't really expect special talents from high-capacity memory modules here.


  Qimonda DDR2-800 2x4096MB
(HYS64T512020EU-25F-A)
Apacer Giant DDR2-1066 2x2048MB
Memory controller mode Ganged Unganged Ganged Unganged Ganged Unganged
Memory clock rate, MHz
(DDR2 MHz)
400
(800)
400
(800)
456
(912)
460
(920)
400
(800)
400
(800)
Core clock rate, MHz
(DDR2 MHz)
2400 (200x12) 2400 (200x12) 2736 (228x12) 2760 (230x12) 2400 (200x12) 2400 (200x12)
Memory controller clock rate, MHz
(DDR2 MHz)
2000 (200x10) 2000 (200x10) 2280 (228x10) 2300 (230x10) 2000 (200x10) 2000 (200x10)
Default memory timings, voltage 5-5-5-18-2T,
1.8 V
5-5-5-18-2T,
1.8 V
5-5-5-15-2T,
2.3 V
5-5-5-18-2T,
2.3 V
5-5-5-15-2T,
1.8 V
5-5-5-15-2T,
1.8 V
Min. stable voltage (not tested) (not tested) 2.26 V 2.22 V (not tested) (not tested)
Avg. read bandwidth (MB/sec),
1 core
6082 5535 6938 6354 6195 5760
Avg. write bandwidth (MB/sec),
1 core
3469 3459 3960 3979 3548 3588
Max. read bandwidth (MB/sec),
1 core
7014 6366 8000 7306 7149 6619
Max. write bandwidth (MB/sec),
1 core
4888 4953 5575 5700 4965 4983
Avg. read bandwidth (MB/sec),
4 cores
10764 10715 12270 12406 10960 11078
Avg. write bandwidth (MB/sec),
4 cores
3506 4965 4000 5730 3550 5104
Max. read bandwidth (w/PF, MB/sec),
4 cores
11047 10749 12594 12454 11238 11105
Max. write bandwidth (NT, MB/sec),
4 cores
6288 5604 7168 7228 6315 6315
Min. pseudo-random access latency, ns 36.4 38.8 32.0 33.9 35.7 37.0
Min. random access latency*, ns 90.1 93.3 79.0 81.1 88.2 89.5

Block size: 32 MB

In our tests we also used a memory kit of lower capacity (2 x 2048 MB) from Apacer as a reference. You can see that performance differences at the same frequency (DDR2-800) are minimal. If you take a closer look, you can see that Qimonda modules suffer from a tad deeper writing performance slump in unganged mode, that's all.

Although these modules are apparently not targeted at overclockers (they do not come with heat spreaders and do not offer recommended modes with increased frequencies and voltage), they can still be overclocked. Their overclocking can make up for performance differences with memory modules of lower capacity (operating at the nominal frequency, of course) over and above.

Curiously enough, when overclocked, our modules under review demonstrate stable operation at a higher frequency in unganged mode, while their voltage is reduced from 2.3 V (it's a tacit maximum point, prolonged operation at higher voltages may shorten the service life of memory modules) to 2.2 V.

Conclusions

4GB DDR2 memory modules are not exotic anymore, their prices have dropped from the sky-high level. Workstation modules with ECC support are still the most widespread products in this category, but you can also get this much memory for your desktop as well. At least performance and reliability of the tested Qimonda modules meet the challenge, so you won't have to sacrifice either of those.


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