Lowest Latency Test Results
Using a relatively safe 1.80 volt setting, the DDR3-1333 test modules reached the following "best stable timings" at 1600-MHz, 1333-MHz and 1066-MHz data rates.
| Lowest Stable Latencies at 1.80 Volts | ||||
|---|---|---|---|---|
| DDR3-1600 | DDR3-1333 | DDR3-1066 | Rated Settings | |
| Aeneon X-Tune DDR3-1333 | 9-8-8-15 | 8-7-6-13 | 6-5-5-10 | 8-8-8-15 |
| G.Skill PC3-10600 | Failed | 8-7-7-14 | 7-6-6-12 | 9-9-9-24 |
| Kingston HyperX PC3-11000 | Failed | 7-7-6-13 | 6-6-5-12 | 8-8-8-24 |
| Kingston ValueRAM PC3-10600 | 9-7-6-15 | 8-6-6-12 | 6-5-4-9 | 8-8-8-24 |
| Mushkin EM3-10666 | 9-8-7-14 | 8-6-5-14 | 6-5-4-14 | 9-9-9-24 |
| OCZ Platinum PC3-10666 | 8-7-6-15 | 6-5-4-12 | 4-4-3-9 | 7-7-7-20 |
| OCZ ReaperX PC3-10666 | 8-7-6-13 | 6-5-4-12 | 5-4-3-8 | 6-5-5-18 |
| Patriot PC3-10666 | Unstable | 6-6-5-12 | 5-5-4-9 | 7-7-7-20 |
| Super Talent PC3-10600 | 7-6-6-13 | 6-5-5-10 | 5-4-4-9 | 8-8-8-18 |
| Wintec AMPX PC3-10600 | 8-7-6-15 | 6-5-4-12 | 5-4-3-9 | 9-9-9-24 |
OCZ pulls amazing 4-4-3-9 timings at a 1066-MHz data rate, while the potentially lower-cost Wintec AMPX finds itself in a three-way tie with both OCZ kits at DDR3-1333. Overclockers looking for the lowest latency might prefer Super Talent’s 7-6-6-13 timings at a 1600-MHz data rate.
Patriots DDR3-1333 had reached a stable 1652-MHz data rate on Gigabyte’s top-end P35 motherboard, but the Asus Maximus Extreme’s X38 chipset appears to be just a little more finicky. The modules didn’t even reach a 1600-MHz data rate on the newer platform, but tied for second place in DDR3-1333 latencies.
Lower latencies are meant to improve system performance, so let’s consider what the benchmarks can tell us.
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One part on page 3 is a bit confusing to me:
"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!"
If I am reading this right, cycle time is the inverse of (1/2)*(DDR Data Rate or 333 for example). So 1/((1/2)*333)=.006006006 which rounds to 6 milli-seconds, not 6 nano-seconds.
Sorry for my confusion, but could someone please clarify for me?
I can not clarify...this is a good article, but im still anoyed at the spelling and punctuation in the articles...Im not one for utmost spelling and punction in informall chatting messaging etc (like this) but i am when its a published article, you wouldnt find a harry potter novel with spelling mistakes in it....
"and DDR3-1600 is called PC2-12800." Its surposed to say, PC3-12800 not...PC2-12800
On the first page mid way down ^^^
Therlian you got it wrong. Generally, period (cycle time) it's the inverse of frequency (clock speed). But as DDR stands for Dual Data Rate, its real frequency is 1/2 of the specified clock speed. What you did wrong it's that you didn't take in account that DDR-333 means a data rate of 333 MEGA-hertz. Because a hertz is the inverse of a second you get: 1/((1/2)*333 MHz)=.006 micro- seconds, which is equal to 6 nano-seconds. Hope I made it clear for you.
I see now danmari. Thanks for pointing that out. I don't know why I didn't think about the 333 being MHz as opposed to Hz.
"I can not clarify...this is a good article, but im still anoyed at the spelling and punctuation in the articles...Im not one for utmost spelling and punction in informall chatting messaging etc (like this) but i am when its a published article, you wouldnt find a harry potter novel with spelling mistakes in it...."
Sorry but when you make THAT many mistakes in your own post, you have no right to talk about spelling mistakes. The mistake you mention is a typo (hitting a wrong key) not a spelling error.
You however manage to spell "annoyed", "informal", and "supposed" wrongly. You also managed to spell "punctuation" wrongly (the second time.. not sure how you can spell it right the first time and wrong the second..)
If you don't know how to spell, then don't flame others for it.
anyone with notes PC2100,PC3200,PC4200,PC5300?
"Intel’s current fastest Front Side Bus (FSB) uses a 1333-MHz data rate"
No, that's not right!
It's 1600MHz (native) for a Socket 775 CPU and socket 771, and if you didn't notice, some people overclock, big time!
Although DDR3 is touted as using 1.50V, several modules use more!
The same is true of DDR2. In this article DDR2 is described as being 1.8V. In my experience most of the modules are 1.9V and some are higher.