OCZ PC3-10666 ReaperX HPC Enhanced Bandwidth
Anyone impressed by the fact that OCZ’s medium-performance Platinum Edition is rated at the same timings of some competitor’s high-end parts will be even more impressed by the rated timings of its ReaperX series. Equipped with a twin-heatpipe radiator, each ReaperX module is rated for a 1333-MHz data rate at CAS 6.
But while CAS 6 might sound impressive, these are no ordinary CAS 6 timings. The full set of standard timings is 6-5-5-18, which is quicker than the 6-6-6-x timings normally associated with the "CAS 6" label. The elaborate cooling system comes into play here, as the recommended setting to reach 6-5-5-18 timings at DDR3-1333 is 1.85 volts.
So the builder must enter BIOS and manually configure the speed, latency and voltage in order to run ReaperX modules at rated performance levels. This is excusable for a module set that’s marketed towards the "extreme performance" crowd who should be familiar with BIOS configuration, but might seem a bit daunting to new builders.
In fact, even at its 533-MHz SPD value (DDR3-1066), these part number OCZ3RPX1333EB2GK ReaperX modules use 6-5-5-20 rather than 6-5-5-18 timings, but at least the DDR3-1066 automatic configuration is provided to ease "first boot" stability prior to any manual BIOS changes.
Missing is any DDR3-1333 SPD value, and we instead find an odd DDR3-1244 value of 622 MHz clock speed and a DDR3-1422 value of 711 MHz. None of our boards defaulted to DDR3-1422 timings at DDR3-1333 clock speeds when using an FSB-1333 processor, but instead the ReaperX modules always dropped to DDR2-1066 via automatic configuration. CPU-Z indicates that this may be because the modules are electronically labeled as PC3-8500 rather than PC3-10700.
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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.