Decision Between Two Gpus

Should I put 2 graphics cards in SLI, or just buy a better one?

TL, DR: Conventional wisdom in Graphics card technology state that just use one, make sure its a good one.The primary function of the SLI bridge is to add more GPU cores (CUDA cores for Nvidia) from extra available GPU’s and make them function in tend-um as if its one GPU while reducing the bandwidth constraints (if any). Many times this method may not be feasible or perform-ant; because many games don’t max out the PCI-e bridge bandwidth. Meaning you may buy three cheaper GPU’s and bridge them, and they still will not be able to outperform a single good GPU.Hence for gaming its suggested to buy a single one which is best suited in your budget (even a 2nd hand is fine) versus two or more. Also know that two cheaper GPU’s would depreciate in value faster vs one powerful single card. Eg: buying two 1060’s vs one 1080Ti. For video encoding, you can buy an array of cheap cards with high core count and make them do the parallel work faster which a Processor can’t at the cost of using more power, which means you might need to upgrade your power-supply too as a cost overhead.Here is an example of comparison for games:More details here:Scalable Link Interface - Wikipedia

What is better, two good graphic cards or one superb graphic card to play video games in a computer?

Single superb card is always better.There is only one very specific scenario when having two video cards is better, and it's not “two good graphics cards” it's “two of the top of the line graphics cards, running extremely high resolution (today that's either 4k or 8k), with an unlimited budget.”This is the only scenario where having two GPUs makes sense. It never makes sense to have two inderior GPUs over one greater GPU.This is because the benefits of running two GPUs in parallel isn't double. You don't get double the performance of one card; the benefit is highly-diminishing. It's closer to a 20% improvement most of the time.The only time you get anything close to double the performance is when running at high resolution. The rendering technique used in this case is to use one video card to render half of the pixels and the other for the other half. This gives the best returns for cards run in SLI or Crossfire.A card which normally doesn't have the throughput to handle a high resolution can manages to eke out the most benefit from two weaker cards by splitting the pixel rendering like this.However, you are generally better off with one better card. A single great GPU will outperform two lesser GPUs for the price, especially at resolutions around 1080p, which is the standard today.Worse, SLI and Crossfire still run into issues which can cause problems with games, like rendering problems or even game crashes. You're also generating a lot more heat and using more power. It's just really not worth it.Do not bother with SLi unless you just want to burn money and just want the bragging rights of have an Uber setup.Some people are recommending buying one great card today then adding a second card a few years down the line as an upgrade. I've gone down this path and regretted it. It's nonsense. Just sell the old GPU and buy a better single one when you want to upgrade. Trust me on this.

Why can’t you have two different graphics cards in SLI/Crossfire?

Alright, let me try to answer this as accurately as I can…Long ago there was a lot of work (as in several years worth) done internally at both AMD (then ATI) and NVIDIA to determine what advantages there would be putting any two GPUs together, not just two (or 3 or 4) identical ones. Testing showed that it could work to put two similar but not the same GPUs in the same system and produce a usable image for gaming, so it was possible to do it this way.However, testing also showed that the graphics drivers spent as much time attempting to compensate for the fast vs slow or low memory vs high memory or generation 6 vs generation 7 GPUs as to be almost always slower than the next fastest single card available for that given generation. So, given that the performance and overhead would suffer the idea of running unlike GPUs in parallel as a single virtual GPU for gaming (or media processing) was dropped.Since that time, several other companies have tried to do something similar, and Windows 10 can allow unlike GPUs to be used in the same system simultaneously, but none of these options provides the performance vs wattage vs cost advantage of a matched pair of the same generation of GPUs linked into one virtual graphics solution.So there you have it. It isn’t greed, it isn’t company decision making, it comes down to real performance and end customer benefit.

Does gaming depend on good motherboard?

Your MOBO is extremely important for any computing task. I would go so far as to say it’s the MOST important part of any PC. The MOBO is like the human skeleton, which, without it you would be a pile of jelly on the floor. Without a MOBO you would only have a pile of nice PC parts.The MOBO determines a few things.What kind of CPU you can useHow many and what kind of PCI devices you can useWhether you need to buy extra expansion cards like WiFi, Sound, StorageWhether or not you can use current storage technology like M.2, Optaine, USB 3.0/3.1, Thunderbolt.The size of the MOBO determines the size of your case, can’t put an ATX board in an ITX caseHow much, and what kind of RAM you can useOverclocking!!!!!As you can see, there are many options on your motherboard, and although all MOBO’s could get the job done, picking the right one for YOU is an important decision.