As you upgrade to an Intel socket 775 motherboard that requires DDR2, which memory modules will keep your machine at the top of the food chain when it comes to overclocking? Or which devices are better suited for more routine, yet high-end computing needs? We procured 16 DDR2 DRAM modules after asking vendors to send us their finest to find out.
The first thing that struck us were disparities in the modules' purported bandwidths. Labels ranged from DDR2-533 to a dubious DDR2-1000 designation. We also received some hand-inscribed early prototypes that some of our vendors probably haven't yet brought to market (or have they?). We'll answer this last question in our upcoming live stress test, when THG will purchase winners from this round of tests and put them through an endurance trial and more overclocking tests.
DDR2 modules for overclocking to the maximum of stability.
There have recently been a few changes in memory modules. First, the delivery of new Intel platforms based on 915 through 975 chipsets for socket 775 have mandated use of DDR2 modules. AMD is also working toward DDR2 support in the near term, which is necessary to support their new processor sockets. DDR2 is supplanting conventional DDR memory, thanks to many underlying technical advantages that work in its favor: The processes used to make the chips are based on 110-nm and 90-nm production, which reduce power consumption vis-à-vis "old" DDR modules. One consequence is that far less heat dissipates from these lower-powered components, which also offer faster transfer rates (4 Byte prefetch) and higher clock speeds. DDR2 also makes it easier to fit 2 GB worth of memory chips on a single DIMM (although a few 2 GB DDR modules are available, they're rare and fairly expensive).
Right now, the time is ripe for buying memory: generic 1 GB modules are available at rock-bottom prices start at around $60, while 512 MB models go for as little as $35. Performance improvements of as much as 40% are possible simply by replacing slower memory modules with those optimized for a specific hardware configurations (in fact, 40% is the memory bandwidth difference between DDR2-533 and DDR2-800). Overclocking is at the heart of this comparison review, because it can increase overall memory bandwidth by as much as 50%.
As opposed to the mostly marginal effects of modest CPU clock boosts, careful fine tuning of memory timings and clock rates can have profound impacts on performance. Performance of Pentium 4 and Pentium D processors, for example, both scale strongly upward at higher memory throughput rates.
- Optimal DRAM For Overclocking
- DDR2 Parts Details
- Two DRAM Sides Are Better Than One
- BIOS Settings To Boost Performance
- CL4 Or CL3: Boosts Performance By Up To 5%
- More Speed By Tightening Latency Timings
- Boosting Memory Clock Speed: 23% Performance Gains
- Here's How We Tested At THG's Munich Labs
- Wstream And Everest Benchmarks
- Overclocking Tests And Motherboards Used
- Default Settings Test: DDR2-667
- Default Settings Test: DDR2-667, Continued
- Overclocking By Tightening Timings
- Overclocking By Tightening Timings, Continued
- Overclocking To The Max
- Overclocking To The Max, Continued
- Only Asus Boards Convince
- An Overview Of The 16 Test Candidates
- Aeneon DDR2-533: Unbeatable Price/Performance
- Buffalo's DDR2-667 Is Unspectacular, But Solid
- Corsair DDR2-1000: Absolutely The Fastest
- Crucial/Micron DDR2-667 (Ballistix) Is Geared For Overclocking
- GeIL's DDR2-533 Fails To Impress
- G.Skill's DDR2-675 Confusing Label
- Kingmax DDR2-667: Choose The Chip's Color
- Kingston DDR2-900 Offers Minimal Overclocking
- Mushkin DDR2-667's Double-Sided Module With A Need For Speed
- OCZ DDR2-800: The Third-Fastest Test Candidate
- Patriot Memory DDR2-1000 Offers Top Performance Reads At 8.6 GB/sec
- PQI's DDR2-667 Is Fast, With No Overclocking Headroom
- Samsung DDR2-667: Conservative RAM Sans Overclocking
- Twinmos' DDR2-667 Is Slow, But Overclocks Well
- Wintec's (AMP) DDR2-667: 475 MHz When Overclocked