Hi, our local computer supplier bigshot just brought some new memories I'm not familiar with called GEIL and priced the CL4 performance ones at the same price as the common as dirt CL5 twinmos/goodram ones. Naturally I became curious and visited their web page and they at least appear to be descent, if one could judge only by appearances and numbers.
Oh, I just saw that people keep having problems with them in conjunction with 965 mobos.
I will be using it with an Athlon 64 X2 6000+ on a GA-m57SLI-S4 (nForce 570 SLI chipset). For that price I can get either one or the no-name CL5 ones so it really isn't a matter of price but rather performance.
I would say the BD is more of a marketing "packaging" type of deal. The Ultra is the one I am most familiar with. Over at Fry's they sell the Ultra and the Value, and seem to have success with both. There was no BD when I was there last week.
The BD (Black Diamond) series uses the Mircron D9 Memory chip modules, which are very good for overclocking. Also they have a Lifetime Warranty and depending out which version of the BD, you could choose either the Dual Channel or Quad Channel. Go to Geil website and look at the Specs for them and check there forum board, I do believe they list what motherboards the BD's will work with.