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Apacer Giant DDR2-1066 (PC2-8500) Memory Modules

Excellent overclocking potential and somewhat strange SPD.

July 17, 2008



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Test results

Testbed configuration:

  • Processors: AMD Phenom 9750 (Socket AM2+), 2.4 GHz (200x12)
  • Chipset: AMD 790FX
  • Motherboard: ASUS M3A32-MVP Deluxe, BIOS 1001.

In these tests we also compared memory performance in ganged and unganged modes of Phenom memory controllers. In the first mode the memory controller works as a single 128-bit controller, in the second case -- as two 64-bit ones. So the ganged mode demonstrates higher results in single-core memory access mode and consequently in tasks, where the speed of a single main process is critical. Unganged mode is recommended for multitasking environments. Differences are quite big. As you can see, the effect of a chosen mode on memory bandwidth is similar to that of memory frequency. At the same time, it's sufficient to test memory in any of these modes to compare modules -- if a module demonstrates high performance in ganged mode, it will retain the advantage in unganged mode as well.

Command Rate is set to 2T. All timings, except four main values, are chosen by BIOS automatically.

  Apacer Giant DDR2-1066 2x2048MB Corsair TWIN2X4096-9136C5DF
Memory mode Ganged Unganged Ganged Unganged Ganged Ganged
Memory frequency, MHz
(DDR2 MHz)
400 (800) 400 (800) 533
(1066)
533
(1066)
587 (1174) 575
(1150)
Frequency of the integrated memory controller, MHz
(DDR2 MHz)
2000 (200x10) 2000 (200x10) 2000 (200x10) 2000 (200x10) 2200 (220x10) 2160 (216x10)
Frequency of processor cores, MHz
(FSB clock rate x FID)
2400
(200x12)
2400
(200x12)
2400
(200x12)
2400
(200x12)
2640
(220x12)
2592
(216x12)
Memory timings, voltage 5-5-5-15-2T,
1.8 V
5-5-5-15-2T,
1.8 V
5-5-5-15-2T,
2.2 V
5-5-5-15-2T,
2.2 V
5-5-5-15-2T,
2.3 V
5-8-8-24-2T,
1.94 V
Minimum stable voltage (not tested) (not tested) 1.8 1.8 1.88 1.94
Average memory read bandwidth (MB/sec),
1 core
6195 5760 6728 6373 7385 7060
Average memory write bandwidth (MB/sec),
1 core
3548 3588 3714 3935 4019 3957
Max. memory read bandwidth (MB/sec),
1 core
7149 6619 7883 7428 8651 8281
Max. memory write bandwidth (MB/sec),
1 core
4965 4983 4964 4985 5431 5342
Average memory read bandwidth (MB/sec),
4 cores
10960 11078 11920 13110 13040 12815
Average memory write bandwidth (MB/sec),
4 cores
3550 5104 3847 5570 4220 4182
Max. memory read bandwidth (w/PF, MB/sec),
4 cores
11238 11105 11872 13112 12928 12647
Max. memory write bandwidth (NT, MB/sec),
4 cores
6315 6315 6315 6315 6916 6788
Minimum pseudo-random access latency, ns 35.7 37.0 32.0 33.6 29.7 30.1
Minimum random access latency*, ns 88.2 89.5 75.2 77.6 69.0 79.8

*Block size: 32 MB

Conclusions

First of all we'd like to mention the excellent overclocking potential, which breaks all records among 4GB DDR2 kits, the standard timings scheme preserved. Frankly speaking, we didn't expect such results from these simple-looking modules. A much more expensive memory kit from Corsair takes the second place.

Moreover, these modules allow to reduce their voltage from the recommended level. In particular, DDR2-1066 mode is stable at 1.8 V. What concerns the overclocked mode, engineers from Apacer and chip suppliers can be really proud of 1.88 V. But this product has one great drawback: unlike other Apacer products, memory modules from this company are rare guests in retail stores. According to the management, the company is working on sales channels, and the new package for memory modules should promote the retail segment.

Excellent overclocking probably makes up for justified criticism of the strange SPD data. But if your motherboard is not as smart as ours, you will have to provide a backup memory module for the first boot, fix the startup frequency and timings in BIOS, and only then install this memory kit.


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Page 1: Introduction, design, SPD data

Page 2: Test results, conclusions



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