Two Vostro 3300 shipped with 4GB (2x2GB v1.5). 
Attempting upgrade to 8GB, so far without success.
Latest Bios A12

Crucial.com memory selector claims support for 4GB DDR3-12800 CL11 1.35v

I've tried three G-Skill and Samsung products with identical results:

1) G-Skill F3-1600C9D-8GBSL (PC3-12800, CL9, 1.35v)

2) G-Skill F3-12800CL9D-8GBSQ (PC3-12800, CL9, 1.5v)

3) Samsung 4GB 1Rx8 PC3L 12800S-11-13-B4

None boot normally, either as a single device or in combination with existing memory (at same voltage). All devices are recognized in the BIOS (as 1066MHz). Following BIOS splash screen, attempts to boot Windows result in video corrupted in repeated interlaced block pattern and system freezes.

F5 MATS fails with corrupted graphics after several minutes. System is unresponsive.
Memtest 86+ fails almost immediately (Fail-Safe or not) with a spattering of black character cells

These specs appear to be compatible, yet don't work.
Any compatibility suggestions (ideally based on actual experience) would be appreciated.