DDR-2 in a bit of detail
While it has been covered on a few other sites, we really haven't touched on it here at TweakTown in terms of the improvements that DDR-2 has over DDR.
DDR used a simple technique - take the existing SDRAM memory and use both the rising and falling edges of the clock cycle to transmit data rather than just the falling of SDRAM. This allowed the memory buffer to send 2 bits of data per clock rather than 1.
DDR-2 uses a 4 bit buffer, so rather than sending 2 bits from the memory cell to the memory buffer, it sends 4. This is why DDR-2 manages to scale so far. To get 400MHz out of DDR, you need the memory cell to be running at 200MHz. To get 400MHz out of DDR-2, the memory cell only runs at 100MHz. This is why we have DDR-2 800 already. We are using the same 200MHz clocked cells, only for DDR-2 this equates to a rating of 800MHz.
DDR-2 was setup for speed from the beginning, in order to ensure a cleaner data signal; a new feature was added to DDR-2, called On-Die Termination. In DDR, the terminating resistors for signal rebound and noise dissipation were put on the board itself next to the DDR slots. This can and did result in some boards having memory signal issues due to cross talk - the longer the trace path has to go, the more it is susceptible to noise (errors).
DDR-2 modules have a series of resistors built directly into the memory chip that acts as the terminating system. This means there is very little chance of external noise interfering with the memory signal as there are no traces for the termination system external to the chips.
When you look at the actual package of the DDR and DDR-2 modules, they almost look identical. This is where things end; DDR uses a 168-pin interface to connect the memory to the board and DDR-2 uses 240 pins. Electrically these modules are also totally different - DDR uses a 2.5v signal and DDR-2 drops this to 1.8v.
DDR-2 is here to stay with both AMD and Intel ratifying DDR2-800 standards for their latest processors and chipsets, with a total of 6.4GB from a single channel DDR2-800 module, that doubles to 12GB with Dual Channel, its clear to see DDR-2 ahs the advantages. We'll see DDR-3 soon but that is still some time away from being released into the market.
PRICING: You can find products similar to this one for sale below.
United States: Find other tech and computer products like this over at Amazon's website.
United Kingdom: Find other tech and computer products like this over at Amazon UK's website.
Canada: Find other tech and computer products like this over at Amazon Canada's website.
- Page 1 [Introduction]
- Page 2 [DDR-2 and how it differs from DDR]
- Page 3 [Benchmarks - Test System Setup and Sandra]
- Page 4 [Benchmarks - PCMark05]
- Page 5 [Benchmarks - ScienceMark 2.0]
- Page 6 [Benchmarks - 3DMark05]
- Page 7 [Benchmarks - 3DMark06]
- Page 8 [Benchmarks - Doom 3]
- Page 9 [Benchmarks - Quake 4]
- Page 10 [Benchmarks - F.E.A.R.]
- Page 11 [Final Thoughts]
Recommended for You
- We at TweakTown openly invite the companies who provide us with review samples / who are mentioned or discussed to express their opinion of our content. If any company representative wishes to respond, we will publish the response here.
Latest News Posts
- CON MAN game has arrived on Apple & Android devices
- Ubisoft culls four PC games due to lack of popularity
- Sonic Boom: Fire & Ice hits the Nintendo 3DS on Sept 27
- Lenovo's new Thinkpad X1 Yoga has a 1440p OLED display
- AMD's next-gen Vega graphics cards launch in early 2017
- Asrock EP2C602-4L/D16 memory question?
- were is the 1394 label
- GB's z170x G7's audio compared to G1's
- Overwatch Eichenwalde Map Preview
- 1833MHz memory in Asus PU551LA
- ADATA launches the ultimate SU800SATA 6Gb/s 3D NAND SSD
- CAPE Audio shakes up the headphone industry with the release of Rebellion Headphones
- Tesoro announces ambidextrous, White Sharur SE Spectrum gaming mouse
- Eurocom launches worlds first GTX 1080 SLI VR-Ready laptop
- Thermaltake new Pacific RGB G1/4 PETG Tube 16mm OD 12mm ID 6 liquid-cooling fittings with 1 RGB LED lighting controller