Memory for new computer

[Denniss]

If SPD is programmed to DDR3-1333 but DIMM advertized as 1600 you can safely assume it's based on cheaper but heavily overclocked/overvolted DDR3-1333 chips instead of native 1600 chips. That's nothing I would buy. (values just taken as example). I remember DDR1 times where RAM requiring 3.2V (instead of standard 2.5/2.6V)  was sold - OCZ and GEIL were prominent members of this voltage gamble. Gamble continied with DDR2 and up to 2.1/2.2V instead of 1.8V standard.
They couldn't continue this with DDR3 as Intel could not guarantee a safe operation of their CPU at RAM voltages above 1.65V, AFAIR starting with Core I-series.

[BaldEagl]

If SPD is programmed to DDR3-1333 but DIMM advertized as 1600 you can safely assume it's based on cheaper but heavily overclocked/overvolted DDR3-1333 chips instead of native 1600 chips. That's nothing I would buy. (values just taken as example). I remember DDR1 times where RAM requiring 3.2V (instead of standard 2.5/2.6V)  was sold - OCZ and GEIL were prominent members of this voltage gamble. Gamble continied with DDR2 and up to 2.1/2.2V instead of 1.8V standard.
They couldn't continue this with DDR3 as Intel could not guarantee a safe operation of their CPU at RAM voltages above 1.65V, AFAIR starting with Core I-series.

Well I told you my computers was older.  Mine were advertised as DDR2 800 @ 4-4-4-12 but default install was DDR2 667 @ 5-5-5-16.  IIRC Kingston allows OC to 2.4V on the DIMMs I have.  I don't remember what the default voltage was but I'll guess 1.65V with advertised specs at 2.0V.  I've been running 4x1 Gb sticks flawlessly for 5 years now at the faster settings.

As I said, the default settings were mearly a compatability issue.  Kingston is a long standing and highly respected manufacturer of memory and it seems incredibly unlikely to me that they were "gambling" with their lifetime warranty.  Rather the HyperX line was/is catering to enthusiasts much like the K series Intel chips.  Upholding their warranty to 2.4V speaks strongly to their faith in their product.

[Denniss]

Doesn't change the fact they were using DDR2-667 chips heavily overclocked and overvolted to achieve DDR2-800 speeds. This is a voltage level that may destroy CPU with integrated memory controller over time (not covered by their "warranty") as that exceeds their tolerance level.

Kingston Value = superb general use RAM
Kingston HyperX (and other bling-bling OC ram with LED and/or big heatspreaders) = may work or may create lots of issues