PDP Patriot Extreme Performance PC3-10666 Low Latency
PDP Patriot sent us its part number PDC34G1333LLK, were the LLK at the model number’s end stands for low latency (dual-channel) kit. Offering the same CAS 7 timings as Kingston’s high-end HyperX and OCZ’s midrange Platinum Edition, these modules also provide something we didn’t see in the other kits: 4 GB of capacity. While most brands offer 4.0 GB kits to customers, Patriot is on the only one to supply this capacity for an overclocking and under-latency competition.
That Patriot is confident enough to supply high-capacity modules for a speed race says a lot about its confidence in these parts, as tight timings and high speeds become more difficult to accomplish as capacities are increased. Like Kingston and OCZ, however, the company suggests that builders should enter BIOS and raise DIMM voltage from 1.50 to 1.70 volts before manually setting the rated DDR3-1333 speed for its 7-7-7-20 timings.
In fact, a DDR3-1333 SPD value isn’t even found in Patriot’s SPD table, but the 7-7-7-20 timings are found for operation at DDR3-1066 (533-MHz clock) using a system’s default 1.50 volts. For builders who are comfortable in BIOS, the change is usually as simple as setting the speed and voltage using the detected 533 MHz timings.
A 457 MHz (DDR3-914) SPD value is also found, which allows FSB-800 processors to operate with DDR3-800 memory speed via automatic configuration prior to any manual BIOS changes.
Lacking any DDR3-SPD values, our sample kit defaulted to DDR3-1066 on both Gigabyte and Asus motherboards using FSB-1333 and FSB-1600 processors.
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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.