Thanks, I appreciate the replies.
- Is the GTX 285 1GB for Mac near the same standard as the GTX 260 for PC?
- What's ECC RAM?
- What's the benefits of a Intel Xeon processor?
Is the ATI Radeon 4870 better than the GTX 260 for PC?
Kind Regards
Always glad to help, especially if I get my facts right!

(grain of salt, always...

)
ECC RAM - it's error checking, so even if one data bit is compromised, ECC will repair it on the fly. This is a TREMENDOUS advantage with large files or calculations, where accuracy is a must.
Xeons are by and large identical to their i7 siblings, except ECC is enabled and a couple other sundry issues. By and large, name aside, they are identical - same CPU 45nm design - but the Xeons allow server/pro workstation stability that i7 systems just won't have, which is why those systems are cheaper. Certain Xeon models have multiple data paths (QPI) and allow SMP (symmetric multiprocessing between two physical CPUs). Those are the 5500 series chips. The single quad core Mac Pros use the 3500 series, which have one QPI channel and won't operate on a multi-CPU system board.
The QPI, as I recall, replaces the
front side bus, allowing much faster access to system RAM. It also makes overclocking more of a chore, but that's the problem for Windows users, who need a 400MHz bus (or the QPI equivalent) to make Vista crawl at a near-acceptable level... (Before dumping MS, I had vista 64-bit and the difference between 333MHz and 400MHz was instantly noticeable. That's BAD, to have to run a high-end CPU (Q9650) out of legal specs just to get the OS to run at an acceptable speed...)
Back when I was a PC freak, I looked at the GTX260 and 4870. I bought the GTX260. Both were on par for some apps... for some games, the GTX was better and it was more overclockable.
But that's Windows.
Apple writes its own drivers and, technically speaking, ATi's hardware has more hardware oompf to it -- nVidia just writes more efficient drivers. (ATi's drivers for Windows and Linux always stunk.)
In short, the 4870 might do best in a Mac. But I have no solid benchmarking information, except that the 4870 cremates the puny GT120 (a re-branded nVidia 9400, says the rumor mill).
I will say this: If you buy a Mac Pro new, for $200 (or $180 student), the cost of the 4870 is well worth the upgrade rather than sticking to the stock GT120.
