Intel X-25 VS X-25 Mainstream.

You could quote the part numbers and we can see better but I assume one is the retail version with a 3.5" bracket and the other is the oem style with just a bare drive.

There is an x-25e which is the enterprise version but I don't think you're seeing that here.

No they are both retail

Sorry for the limited info. Here is the link for both items.

399.99 - http://www.newegg.com/Product/Product.aspx?Item=N82E168...

415.99 - http://www.newegg.com/Product/Product.aspx?Item=N82E168...

Look closely at the part numbers:

SSDSA2MH160G2K5 - this one doesn't come with a mounting bracket
SSDSA2MH160G2R5 - this one comes with the 2.5" to 3.5" mounting bracket

You can buy mounting brackets for less than the difference in price, though.

For the newegg details under features they both say they come with a mounting bracket. Only difference is the 419 one does not say SATA data cable inlcuded in the features . So i'm not sure what you mean unless Newegg made an error in the listing.

399.99 - Includes installation kit that contains: 3.5" desktop drive bay adapter to 2.5" SSD adapter bracket, SATA data cable, power cable, screws, installation guide, and warranty documentation

419.99 - Includes installation kit that contains: 3.5" desktop drive bay adapter to 2.5" SSD adapter bracket, screws, installation guide, and warranty documentation

I saw that too and it made me wonder but I didn't have time to take the trip down intel lane. I wouldn't get too worried. If you're in the market for a $400 ssd you should look to the sandforce 2000 series coming out any day from OCZ

I was under the impression that it was only the ...R5 SKU that included the mounting bracket, but I could well be wrong.