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4GB Extreme III SDHC Memory Card |
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$49.99 |
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4GB Memory Stick Pro Duo | $44.99 | |
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Voyager 8GB Flash Drive | $30.99 | |
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8GB Cruzer Micro USB U3 Flash Drive | $49.79 | |
| 8GB Optima Pro Attache USB Flash... | $29.99 |
- 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
Source: Tom's Hardware US – Keywords: ddr3, 1333, speed, latency, shootout
Topics: Buyer's Guides
Syndication:
Overclocking Results, Continued
We saw how PC Mark 2005's memory bandwidth benchmark mostly reflected the overclocking capabilities of each module set, so let's drive the point home with SiSoftware's Sandra memory benchmark.
Sandra's results again are mostly due to memory speed, though Super Talent's 920 MHz memory clock somehow outperformed Wintec's 930 MHz memory clock, which was likely due to timings other than the four we set manually.
Of course the real reason why overclockers should consider DDR3 is to remove any memory speed limitations that might impede CPU overclocking. Given the small difference in memory performance-per-clock, overclockers should consider the fastest memory that fits within their budget.
- Previous page Overclocking Results
- Next page Boot Straps, I.e., Intel's "Wrench In...
"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?