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Andrew Savchenko <bircoph@g.o> writes: |
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|
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> Hi, |
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> |
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> On Sun, 05 Jun 2016 19:34:15 +0200 lee wrote: |
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>> Hi, |
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>> |
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>> is there a way to reasonably use two graphics cards with a single |
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>> display? |
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>> |
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>> SLI won't work because it's retarded in requiring the GPUs to be the |
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>> same, which they aren't --- not to mention that the cards would be too |
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>> far away from each other in the slots for a bridge to fit. |
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>> |
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>> So what I'm thinking of is like using one card as a default and being |
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>> able to use the other one to play a video in some window on the same |
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>> display, preferably managed by the same fvwm, with the window optionally |
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>> being fullscreen in size. I'd like to do that because the card I have |
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>> isn't powerful enough to play a video while an open gl application is |
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>> running at the same time. |
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>> |
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>> I'll probably get a better card once prices come down a bit, but it |
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>> might have the same problem, and why would I want to waste an otherwise |
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>> perfectly good graphics card. |
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> |
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> Yes, but it depends on your hardware setup. What's yours and why |
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> you need such unusual thing: connect two video cards to a single |
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> monitor, or do you mean by display X display spawn over multiple |
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> monitors? |
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|
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a single monitor |
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|
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> In case of laptops such configuration is quite common: they may |
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> have two video cards with single switchable output: intel card is |
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> used for general work to save power and nvidia card is used for |
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> applications, requiring high GPU performance. Switching is done |
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> using sys-power/bbswitch. But looks like this is not your case, |
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> since you are talking about card replacement, since most laptop GPU |
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> cards are not replaceable. |
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|
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Right, it's not a laptop, and I don't want to switch between different |
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cards. |
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|
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> If you want a multihead setup using two cards, this is trivial using |
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> either xinerama or X screens depending on your taste. |
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|
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That is only simple when you have multiple monitors. |
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|
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> As far as I understand your e-mail, you are trying to mux video |
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> outputs of two GPU cards to a single monitor (excuse me if I'm |
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> wrong, but it is hard to understand what your hardware is), this is |
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> also doable if your monitor supports dual input (most modern |
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> monitors do). This way separate X screens may be used to achive |
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> your goal. (Xinerama setup is also possible, but GL acceleration |
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> will be limited to abilities of the weakest card). |
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|
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Exactly, but I don't want to use the picture-in-picture feature of the |
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monitor, and I don't want separate X screens, and I don't have room to |
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fit another monitor on my desk. |
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|
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I simply want to use one of the graphics cards to handle an application |
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that uses open gl and the other one to play a video. |
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|
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> But honestly I don't get why you need this: if you have a powerful |
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> GPU and it is not a laptop, where power consumption is critical, |
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> why just don't use that card? Most cards have multiple outputs, so |
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> it is not a problem to setup multihead with a single card either. |
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|
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The GPU isn't quite powerful enough for some of what I'm doing. |
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Otherwise, it's a perfectly good card. |
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|
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So I need to get a better graphics card, and once I do, it would be a |
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pity to have the current one laying around uselessly. I wouldn't get |
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much if I tried to sell it, so I rather keep it in case I need a spare. |
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Buying another one which is the same, to use SLI, won't help, either. |
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|
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IIUC, it takes some processing power to decode a video, so why not use |
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one of the cards for just that? Multiple cards should be able to work |
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together. |