Kingston 4GB 240-Pin DDR3 SDRAM ECC Registered DDR3 1066 (PC3 8500) Server Memory Model KVR1066D3Q8R7S/4G

Pros: Low CAS Kingston Inexpensive 4GB RAM if you can use Quad Rank RAM

Cons: Quad Rank

Overall Review: This is quad rank ram, so if your planning on using it with Nehalem xeons, you will only be able to use 2 dimms per channel. This may not affect all, but one should be aware of it if your planning to use 3 dimms per channel.

Pros: Runs good, no errors or software problems.

Cons: none

Overall Review: Make sure you do research before buying not all motherboards accept just any memory.

Pros: Good price/performance ratio. Typical Kingston quality.

Cons: None.

Overall Review: RAM typically either works or it doesn't. No problems with this memory on SuperMicro board with X3440 processor.

Pros: Good price. Low CAS.

Cons: Uses only one dimm per channel with new Xeons. QUAD RANK!

Overall Review: I originally bought this ram thinking the new i7 975 would be able to support it, WRONG I did my research AFTER I bought them.. :/ I had my fingers crossed not believing the spec sheet of the i7 975. I RMAed them back for a 15% cut. Lesson learned only TOO well.. :(

Pros: ECC space wave RAM for Xenons.

Cons: Didnt read the mobo's supported ram list whiners.

Overall Review: If it doesnt work, YOU messed it up Mr. High-Tech-Level.

Pros: Several days of running 8 threads of prime95 with no errors. After that server still runs rock-solid

Cons: none

Pros: reads 16 gig at boot. Seems to run cool. Good price for 4gb sticks. Low latency for ddr3. Cas 7

Cons: only 1066 mhz but most of the speed comes from ram size and low latency

Overall Review: You really have to check the manufacturers compatibility guide for your mobo when you start getting into the 12-16 gb range. Sometimes ram will work if its not on the list, but you are a test pilot. Most mobos are only rated to work with 1 or 2 specific part# of 4G sticks.