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-2GBNQ | 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.
8
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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.