Tech Review - OCZ DDR2 PC2-5400 Performance Series Memory
Hello again, my name is Rodney Reynolds and welcome to another video review. Today looking OCZ DDR2 PC2-5400 Performance Series Memory, the speed on this memory is 675 megahertz DDR 2 or PC 25400 and has a CAS of 4 and to complete memory timing of 444 and 12. Now, what does DDR and CAS mean? DDR stands for Double Data Rate and that means it doubles the bandwidth of the memory by transferring data twice as fast on both the rising and the falling of the clock cycle. CAS stands for Column Access Select or Column Access Strobe and that essentially means the number of cycles for the memory to get information and then process that information.
Also keep in mind that the lower CAS is much better there are higher CAS so try and keep the CAS as low as possible when over clocking. This memory is dual channel which means better overall memory bandwidth resulting in superior performance but it in order to benefit from this technology you will need to have a dual channel motherboard none dual channel motherboards do not have 240 independent 64 bit memory controllers but dual channel boards do which means they have a 128 bit memory interface.
Now they can be installed singly but obviously the performance will be much less at the same megahertz. Remember this is DDR 2 memory and it does differ from DDR memory in a number of ways. Now let me briefly hit on some of these differences. Well the maximum data rate is different 400 megahertz, 4 DDR versus 667 megahertz for DDR 2 the bus frequency 200 versus 333 DDRAM frequency 200 versus 166. The package type for DDR is TSOP 2 and for DDR2 it’s FBGA.
The voltage is different as well 2.5 versus 1.8 and the pre fetch size is different. 2 bits versus 4 bits and the CAS latency will very quite a bit but in general 2.5 or DDR and 4 for DDR 2. The on dye termination is different as well to eliminate signal noise; DDR uses transistors that are on the motherboard whereas DDR 2 it’s on the memory chip and the out chip driver calibration on DDR2 memory also increases signal integrity. These 240 pin DDR2 DIMM’s look a lot like the 100 and AA4 pin DDR DIMM’s. They are approximately the same size but on a 240 pin DDR2 DIMM’s the notch which is right here is closer to the center of the module and please keep in mind that DDR2 memory is not backward compatible and will only fit in motherboards specifically designed for it.
Now let’s have a close look at this memory, well they are 240- pin DIMM’s with a rated voltage of 1.8 however, they can’t go up to 2.2. Also set has what’s called EVP Extended Voltage Protection on this memory like it does for most of its memory. This memory is on buffered it comes for the lifetime warranty and it is available in two different kits a 1 gigabyte and a 2 gigabyte. It also has a mirrored copper heat spacer.
This memory performs very well its stable reliable and highly over clock able. Of course, DDR2 is still very new to the market and not many motherboards out there supported but if you are in the market for DDR2 memory, you might want to check this out. Overall this is a kick ass product.
Again my name is Rodney Reynolds and this has been another video review. Be sure to check back very soon I will have a brand new one for you then also pop in my website at www.3dGameMan.com and while you’re there you can go to the forums and register and remember registration is completely free. Also keep in mind you can find them a lot more on this product in the forums and as a final note if you love watching my video reviews please help remember to help support 3dGameMan.com. If you wish to support, please visit Support 3GM.com. Until the next time, take care.
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