- Kingston HyperX Registered ECC DDR400 (3:3:3), Legacy Registered ECC DDR400 (2.5:3:3),
- Samsung Registered ECC DDR400 (3:3:3),
- Mushkin Registered ECC DDR400 (2:3:2)
There is, at this point, not much to conclude, the results speak for themselves. There are a number of questions, though, particularly with respect to where the performance hit encountered with the Kingston and Samsung modules comes from. We are in touch with the Kingston engineers who are looking into these issues and will follow up as soon as we get any concrete feedback pertaining to the problem.
Ironically, the Kingston DIMMs are the only ones qualified by AMD, everything else is out of spec and I am already anticipating some emails from our friends at Intel, telling me that if it does not conform to JEDEC specs, or if it is not qualified, it does not count even if the performance is better. It would appear, though, that this is another case for the consumer to decide whether qualifications really matter that much when compliance with them has to be bought with a massive performance degradation.
Special Thanks to Heather Jardim, Kingston and the Kingston engineering team for immediate feedback and discussions.
Disclaimer: We have spent two full days running these benchmarks over and again under any conditions we could come up with. We also had similar results replicated by a third party but that still does not mean that there is no margin for error on our side.
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