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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 | $59.99 | |
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8GB Memory Stick PRO Duo | $119.99 | |
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2GB microSD Card | $7.95 | |
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8GB Cruzer Micro USB U3 Flash Drive | $49.99 |
- 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:
Kingston HyperX PC3-11000
Kingston's HyperX series represents modules that exceed the ratings of standard parts, and its PC3-11000 kit is actually rated for operation at 1375 MHz. The rating is still close enough to the 1333 MHz "standard" data rate for these to be considered "enhanced DDR3-1333," however.
Part number KHX11000D3LLK2/2G provides a dual-channel kit of two 1 GB modules with blue heat spreaders, rated at 7-7-7-20 timing and 1.70 volts. The nonstandard voltage requires manual configuration in BIOS, and the modules default to a slower 533 MHz (DDR3-1066) in order to assure boot capability at a motherboard's default 1.50 volts.
In fact, a DDR3-1333 SPD value isn't even found in the HyperX SPD table, the highest 1.50 volt setting being 609 MHz at CAS 8. Yet, because this RAM defaults to rated timings at a slower clock speed, manual configuration is as easy as changing the speed and voltage in motherboard BIOS.
A 457 MHz SPD value is also able to be automatically configured for DDR3-800 operation when FSB-800 processors are used, while the 533 MHz DDR3-1066 value works for FSB-1066, FSB-1333 and FSB-1600 processors.
- Previous page Kingston ValueRAM PC3-10600
- Next page Mushkin Enhanced EM3-10666
"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?