Shawn, keep in mind not all of the GTX 7x line cards are 256 bit. For example, the GTX 760 is 256-bit, but the GTX 750 is only128. You'd have to check the specs for each card in that generation. However, 256-bit memory interface isn't going to necessarily benefit render speed, because the clock speed of each core is so much less efficient than 1060, which is in also his price range. For example, the GTX 1060 has between 1152 to 1280 Cuda cores depending on which version you go get. Each core has a base clock speed of 1506 MHz with boost clock of 1708. The GTX 760 Ti has more cores with 1344, but the clock speed of each core is only 915 MHz with a boost of 980 MHz. Even though the interface of the 760 is 256-bit, the memory transfer rate is slower than the 1060 too. Another disadvantage is that all GTX 7x generation cards utilize the old Maxwell architecture, which is far less power efficient than the new Pascal. So, I'm not sure the GTX 7x generation of cards would be the best investment for the purposes of render speed, but pretty much any GTX card will show dramatic improvement over his current configuration. So it all depends on how much he's willing to spend, and if the software truly supports GPU rendering.

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