DDR Sdram Memory Modules for Desktops

DDR RAM. MEMORY MODULE, COMPUTER MEMORY

1) DDR 266/333/400 MHz
2) 168/184/240-pin socket type dual in line memory module (DIMM)
3) 1.8V power supply
4) Data rate: 533/667/800Mbps (max. )
5) 2.5 V (SSTL-2 compatible) I/O for DDR I products, 1.8Vpower supply for DDR II products
6) Double-data-rate architecture, two data transfers per clock cycle
7) Bi-directional, differential data strobe (DQS) is transmitted/received with data, to be used in capturing data at the receiver
8) Data inputs and outputs are synchronized with DQS
9) DQS is edge aligned with data for read, center aligned with data for write
10) Differential clock inputs (CK and CK)
11) DLL aligns DQ and DQS transitions with CK transitions
12) Commands entered on each positive CK edge: Data and data mask referenced to both edges of DQS
13) Four internal banks for concurrent operation (component)
14) Data mask(DM) for write data
15) Auto precharge option for each burst access
16) Programmable burst length: 2, 4, 8
17) Programmable/CAS latency (CL): 3
18) Programmable output driver strength: Normal/weak
19) Refresh cycles: (8192 refresh cycles/64ms)
20) 7.8US maximum average periodic refresh interval
21) Posted CAS by programmable additive latency for better command and data bus efficiency
22) Off-chip-driver impedance adjustment and on-die-termination for better signal quality
23) DQS can be disabled for single-ended data strobe operation
24) 2 variations of refresh
25) Auto refresh
26) Self refresh

Quality control
1. IC chipset test
IC chipsets we utilize are only top grade from original brands, like HY, Samsung, Elpida, etc. When new IC chipsets are received, we randomly chose samples for test, approximately 10% to 20% ratio, on professional test software---RST. Only if the samples are all without problem, this batch of ICs can be sent to the next test;
2. SPD information test of the Module
To check whether the SPD information is correct, we use two professional soft wares, CPU-Z and Sisoft Sandra 2007, to separately test the module. During this procedure, we subject to international standard AQL to pick samples.
3. Compatibility test of the Module
Samples which are picked according to AQL standard will be installed on more than 200 mainstream brands of motherboards, like Asus, Intel, etc.
4. Stability test
Pick samples according to AQL standard. Only after continuous work WITHOUTCRASH for 48hours individually at 70 degrees centigrade and -10degrees centigrade under big software like 3DMARKS, big games, etc, the Module can be sent out of the factory.