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
- ARMS sells over 100,000 copies in Japan in first week
- Titanfall 2 may hit 6K on Xbox One X with 100% GPU usage
- Take-Two relents on singleplayer GTA mods
- 47% of gamers spend money while playing games
- MSI Afterburner now has hardware plot graphics
- modded my x79-ud3 bios, processor support question
- The Mummy Movie Review
- Computer freeze and audio buzz issue
- AZZA Photios 250 Mid-Tower Chassis Review
- Team T-Force Dark ROG DDR4-3000 16GB Memory Kit Review
- Logitech Circle 2 will be compatible with Amazon Echo Show
- Synology introduces DiskStation DS1517 and DS1817
- Deep Silver and 4A Games are proud to announce Metro Exodus
- Microsoft premieres Xbox One X, world's most powerful console
- Phison gears up for mobile phone market with PS8226 3D NAND eMMC 5.1 controller