I was in a hurry when I wrote that, strips was what I meant, as in using the “split scan lines” along with backburner. A seperate imap will be rendered for each strip in single frame mode but it is best to use a saved imap to ensure that all the strips match.
I was having this problem today. It was a file that I had no problems with until the client asked for it a day early. Then it started crashing at render. Even split scan line caused a crash. I got it ok but not the res I needed.
Which is VERY unfortunate to not get it at the correct resolution! This seems to be a serious problem and hope is resloved in coming builds.
Post your file, I am sure we can get it to render at the required res… just takes some understanding of how things work. 
Ok…I’ll clean up the file and post next week…right now I am in the middle of another project with little time to go! Just bought Windows 64, and am waiting for more ram to arrive! Should I archive the file with all the materials, or should zip the file without texture maps? Thanks!
OK…I installed Windows 64 on the computer (using the same 2 GB Ram…but will increase this now) and now the same file that gave me LOADS of stress is rendering at 3600x2400 leaving the glossy reflections on and using HDR sky. It took 9 hours, but did render. I’m finding now that I have memory problems on my computer at home with the vray raytrace accelerator. I’ll talk about that in another post…SPLOTCHINESS!
try also the bitmap pager. it could help… don^t now how to use it exactly. 
and read this from the vray help…
best regards
themaxxer
i simply cannot render anything bigger then 4000 px. vray just crashes.
it happens too, if i set the displacement mapsize >4000.
seems to be the limit.
my workaround: render it a little bit smaller (< 4000 px) and resize later.
nobody ever noticed, or complained.
andré
hmm, currently have some issues to to get large resolution renderings. Is there some news about this in newer Vray builds? How about the bug that unchecking get resolution from max in Vray frame buffer doesn’t work with DR?
Or region render.