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I am new, some technical advice would be welcome

zx96zx96 Posts: 13
in New Users

Hello, I am new and just starting in the 3D rendering, it seems like a lot of fun! I was wondering, if I were to buy a new machine with rendering in mind, if it were better to have 1xRTX2080 or 2xRTX2070, since it may cost virtually the same where I live, and I think that having 16gb of rendering ram would be better than 8gb. If I read correctly in the forum, I also see that it's advised to then have 3x RAM on the system to use that well. So basically 48gb internal ram and the fastest SSD I can buy. Thanks for any advice / suggestions. At the moment I have tried some rendering on my laptop with a GTX1070 and it takes forever, like 1 hour minimum and in 720p resolution, a little too much.

Comments

  • Richard HaseltineRichard Haseltine Posts: 100,804

    You won't, unfortunately, have 16GN of RAM - each card has to load the whole scene itself. You might get one 2070 for now, and put the other half of te money towards a 2080Ti (or whatever the 30x0 series offers, depending on when they reelase and when Iray supports them) later. Note that if you have two GPUS with different amounts of memory Iray can still use the larger capacity card even if the smaller drops out.

  • magog_a4eb71abmagog_a4eb71ab Posts: 769

    Generally, more cards = more CUDA cores = faster rendering(assuming the scene can fit on ALL of the graphics cards individually). More VRAM on a card = bigger scenes can be rendered without being kicked off to the CPU. Just make sure you have enough RAM in the system. For example, its recommended to have twice as much RAM for the total amount of VRAM you'll be using in renders. 2 x 2070 would give you 16Gb VRAM total, so 32Gb RAM would be needed. If you're going to be doing other stuff on the system while its rendering, then yes, I would go with even more RAM.

  • SixDsSixDs Posts: 2,384

    Sorry, magog, but, as Richard has said, the whole scene has to fit in each cards memory - so the effective VRAM is still only 8Gb even with two 2070's. Therefore the twice the amount of system RAM rule, if true, would mean 16Gb, which is twice the VRAM you'll be able to use in rendering.

  • PaintboxPaintbox Posts: 1,633

    I really don't know where people get that number from (3X times the amount of RAM vs VRAM)  2X times would be sufficient in most cases. It may have been true in the past (Say 2GB VRAM vs 8GB RAM) or 4-16 , but after 16GB VRAM you really don't need 48Gb RAM, 32Gb is more than sufficient unless you go for ultra 8K renders.

  • zx96zx96 Posts: 13

    Thanks everyone for your answers :)

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