Trying to avoid a bottleneck

QXDrakon

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Aug 8, 2017
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I've got a laptop which used to have a Pentium B940 in it. That's a Sandy Bridge Pentium running at 2.0GHz. I upgraded the processor to an i7-2640m which is still a dual-core but it has 2.8GHZ base clock and boosts to 3.2 on both cores, and 3.5 on one. It also has everyone's best friend, Hyperthreading. I would have gotten a physically quad core i7 but I didn't trust the extra 10 watts on my motherboard.

I'm trying to find a graphics card to connect externally to my laptop. I have a mini PCIe connector being used for a wifi card, so I can use that slot. I will find parts to connect the gpu to my laptop myself, but I don't know which gpu to choose. I need something the won't bottleneck the CPU but is efficient. I want to use Pascal because those cards are the most efficient at the moment. I considered a 1030 but I feel like it won't be strong enough for all cases. But I don't know how effective my CPU is for any sort of gaming. Experience tells me it isn't that great. But I know for sure that my iGPU is a bottleneck here just from the fact that it will be maxed out and pumping heat through the fans when the CPU cores are only at 60-70% usage.

So, suggestions on graphics cards?
 

maxalge

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they run at x1 speeds

any card would be utterly bottlenecked by both the slot and the cpu
 

QXDrakon

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Aug 8, 2017
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I disagree. Tests have shown the speed reduction from 16x to 1x to impact performance only around 25%. That's a number I'm pulling out of thin air right now but I remember seeing a video of this test and it was something along those lines. I'm willing to take that performance nerf to get improvement compared to my integrated graphics.
 

maxalge

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If you pulled it out of the air from a video you once saw...

See the problem with that?



Even a laptop with a thunderbolt or Expresscard slot and external screen reduce performance significantly, this is a top of the line model with a mobile I7 7700


Using the internal screen reduces it even further.


/shrug

A monitor, a psu, the adapters... A lot of investment...


At that point a mini itx build would be far superior
 

QXDrakon

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Aug 8, 2017
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https://youtu.be/ljFZsId89XE

Performance impact was more like 40-50%. Still acceptable to me.

I'm trying to reuse my laptop. I don't care if an itx build would be better in every way. That would involve even more investment than this project would. It would also mean my laptop becomes a paperweight.

Work with me here or don't. I'm just trying to pick a Pascal GPU to use.