Which company manufactures "real" double-sided DDR400 memory?

[Biggs]

Taken from Tom's Hardware,

Single and double-sided modules are another source of confusion: on principle, double-sided RAM modules are faster than single-sided, as they can keep twice as many memory pages open.

Single and double-sided modules are another source of confusion: on principle, double-sided RAM modules are faster than single-sided, as they can keep twice as many memory pages open.


The first choice for many applications: Corsair DDR400 RAM.

However, most RAM modules currently sold have chips on one side. There is often confusion here, too, as many manufacturers place the chips on both sides - to enhance the layout - although the module is actually single-sided. In our experience, the double-sided technique provides between three and four percent more performance. There are historical reasons for the market trend towards single-sided modules. Since the days of the old Intel 440BX, chipsets could only manage rows (pages). Usually up to four DIMM slots were available, so that it wouldn't have made any sense to expand your RAM with double-sided modules. And, as big things are made of little ones, so the Intel i875P shows the most progress in its details: it can now handle eight pages.

Aside from the Kingmax (the only one mentioned in the review), the Geil, Infineon, Kingston Hyper X, and OCZ are all single-sided. Anyone knows if the Corsair is a "real" double-sided stick? What about Crucial's offerings?

P.S.
The last paragraph is quite confusing. I know THG isn't that credible of a review site anymore and the articles are just translated from German but for the life of me, I can't seem to understand the last part of the last paragraph. To elaborate, since the 440BX has four DIMM slots available, so why wouldn't it make any sense to expand your RAM with double-sided modules???

 

[HokieESM]

I think Tom is saying that it could only handle four SIDES of RAM. While you can put in a double-sided stick, it takes up two "pages", so you can have two double-sided sticks or four single sided. It was EASILY possible to max out the RAM on the BX without filling up the slots because of this.

Plus, this is nitpicking terribly, anyway. With (especially) the 865 being very finicky about RAM, I would worry more about what worked than if my RAM was double sided or not.

 

[Kingofcomputer]

440BX supports 6 banks only, so the 4th slot is useless if you put in 3 double-side dimm.
You could use the 4th slot if you put in 2 double-side + 2 single-side.