Qimonda DDR2-800 4GB Memory Modules
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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.
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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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