The Memory Articles
- PC Memory: Just the Facts
- The New Arms Race: DDR3-1800 RAM
- Hardcore DDR2 RAM by Corsair, G.Skill, OCZ and Patriot
- Overclocking 9 Value-Priced DDR2-800 Kits
- Corsair's PC10000 Super-Ober-Uber-RAM Sets Sails
- Corsair's XMS2 Dominator: The World's Fastest DDR2?
- Live Memory Test: Overclock 'Em Till They Crash
- Tight Timings vs High Clock Frequencies
- Navigating the Memory Upgrade Jungle
- In Search of True DDR2 Bleeding Edge Memory
10:40 AM - January 4, 2008 by
Thomas Soderstrom
Source: Tom's Hardware US – Keywords: ddr3, 1333, speed, latency, shootout
Topics: Buyer's Guides
Syndication:
Source: Tom's Hardware US – Keywords: ddr3, 1333, speed, latency, shootout
Topics: Buyer's Guides
Syndication:
Table of Contents:
SPD Timing Comparison
Though we will find the lowest stable timings at increased voltage in our later "lowest stable latency" tests, a chart comparing all the rated timings should help determine which market each module set is really targeting.
| Automatic Configuration Data (MHz: tCL-tRCD-tRP-tRAS) | ||||
|---|---|---|---|---|
| Brand/Model/Part Number | Detected | SPD Timings | Rated Settings | SPD Extensions |
| Aeneon | 667: 8-8-8-15 | 416: 5-5-5-15 | DDR3-1333, | None |
| X-Tune DDR3-1333 | 500: 6-6-6-18 | CAS 8-8-8-15, | ||
| AXH760UD00-13G | 667: 8-8-8-24 | 1.50 V | ||
| 750: 9-9-9-27 | ||||
| G.Skill | 667: 9-9-9-24 | 444: 6-6-6-16 | DDR3-1333, | None |
| PC3-10600 | 592: 8-8-8-22 | CAS 9-9-9-24, | ||
| F3-10600CL9D-2 GBNQ | 667: 9-9-9-24 | 1.50-1.65 Volts | ||
| Kingston | 667: 8-8-8-24 | 416: 5-5-5-15 | DDR3-1333, | None |
| ValueRAM PC3-10600 | 500: 6-6-6-18 | CAS 8-8-8-24, | ||
| KVR1333D3N8/1G | 583: 7-7-7-21 | 1.50 Volts | ||
| 667: 8-8-8-24 | ||||
| Kingston | 533: 7-7-7-20 | 457: 6-6-6-18 | DDR3-1333, | None |
| HyperX PC3-11000 | 533: 7-7-7-20 | CAS 7-7-7-20, | ||
| KHX11000D3LLK2/2G | 609: 8-8-8-23 | 1.70 Volts | ||
| Mushkin Enhanced | 667: 9-9-9-24 | 444: 6-6-6-16 | DDR3-1333, | None |
| EM3-10666 | 518: 7-7-7-19 | CAS 9-9-9-24, | ||
| 996583 | 667: 9-9-9-24 | 1.50 Volts | ||
| OCZ Technology | 667: 7-7-7-20 | 476: 5-5-5-15 | DDR3-1333, | None |
| PC3-10666 Platinum Edition | 571: 6-6-6-18 | CAS 7-7-7-20, | ||
| OCZ3P13332GK | 667: 7-7-7-20 | 1.80 Volts | ||
| 761: 8-8-8-23 | ||||
| OCZ Technology | 533: 6-5-5-20 | 533: 6-5-5-20 | DDR3-1333, | None |
| PC3-10666 ReaperX | 622: 7-6-6-24 | CAS 6-5-5-18, | ||
| OCZ3RPX1333EB2GK | 711: 8-7-7-27 | 1.85 Volts | ||
| Patriot Extreme Performance | 533: 7-7-7-20 | 457: 6-6-6-18 | DDR3-1333, | None |
| PC3-10666 Low Latency Kit | 533: 7-7-7-20 | CAS 7-7-7-20, | ||
| PDC34G1333LLK | 1.70 Volts | |||
| Super Talent | 533: 7-7-7-20 | 533: 7-7-7-20 | DDR3-1333, | XMP-1600 |
| PC3-10600 CL8 | 609: 8-8-8-23 | CAS 8-8-8-18, | CL 8-8-8-28 | |
| W1333UX2G8 | 1.80 Volts | 2.00 V | ||
| Wintec Industries | 533: 8-8-8-20 | 400: 6-6-6-15 | DDR3-1333, | None |
| AMPX PC3-10600 | 533: 8-8-8-20 | CAS 9-9-9-24, | ||
| 3AHX1333C9-2048K | 1.50 Volts | |||
Aeneon and OCZ both provide SPD values in excess of their rated speed, while Super Talent uses Intel XMP automatic overclocking capabilities to go even higher. Kingston and PDP Patriot instead target the low-latency crowd, but OCZ appears to shoot for both markets with both of its products.
- Previous page Wintec AMPX PC3-10600
- Next page Test Settings: Overclocking Comparison
"Because cycle time is the inverse of clock speed (1/2 of DDR data rates), the DDR-333 reference clock cycled every six nanoseconds, DDR2-667 every three nanoseconds and DDR3-1333 every 1.5 nanoseconds. Latency is measured in clock cycles, and two 6ns cycles occur in the same time as four 3ns cycles or eight 1.5ns cycles. If you still have your doubts, do the math!"
Based off of the cycle-based latencies of the DDR-333 (CAS 2), DDR2-667 (CAS 4), and DDR3-1333 (CAS8), and their frequences, you come to the conclusion that each of the memory types will retrieve memory in the same amount of time. The higher CAS's are offset by the frequences of the higher technologies so that even though the DDR2 and DDR3 take more cycles, they also go through more cycles per unit time than DDR. How is it then, that DDR2 and DDR3 technologies are "better" and provide more bandwidth if they provide data in the same amount of time? I do not know much about the technical details of how RAM works, and I have always had this question in mind.
Thanks
Bandwidth = Rate at which you can get the "goodies"
7-7-6-24-2t at 1333Mhz or
9-9-9-24-2t at 1600Mhz
This is FSB at 1600Mhz unlinked. Is there a method to calculate the best setting without running hours of benchmarks?