The word is air-Flow. Not air by itself. In a pc case are multiple heat generators, the Sata controller chip, pcie (old Northbridge chip) VRM's, ram, drives, anything that has a heatsink etc. Then there's the 2x massive heat sources them being the cpu and gpu. So let's say you have 1 exhaust fan. It works by a vacuum in front of the blades, the byproduct being it exhausts the air filling that vacuum out the back. With only that 1 exhaust, where does the air come from? The nearest place the vacuum can draw it from. Which is the venting right below/to the side or above that fan. This happens to also pick up a good chunk of heat that has risen/pushed out from the gpu/cpu. Where does the gpu/cpu get its air from? The surrounding area, which is recycled in/out the heatsinks. Highly inefficient at keeping low temps since it's impossible to cool something by mechanical means to below ambient temps. If the inside of the case by the gpu is 60°C, the lowest possible temp will be 61°C for the gpu.
Works exactly the same for a single intake source, whether that's 1 fan or 3. Air comes in, and just heats up, escaping slowly out from any cracks/seams/vents.
The answer is you need both. Intake and exhaust. This puts cool air in, which gets heated by the heatsinks, but also kicked out by the exhaust in a constant air-Flow. You don't need gale force winds, just a solid stream in/out. Ideally you'll want enough cfm to overcome the BTU of the heatsinks. This is normally attained by 2x low front intakes and 2x top/rear exhaust, creating a diagonal flow up through the heat and out the top corner.
Without decent airflow, you don't own a pc, you own an oven that plays games.
At 1080p, the gtx1660ti beats out the older gtx1070 by a small margin at the same power consumption as a gtx1060. The RTX2060 barely beats out the 1660ti. The only advantages the RTX2060 offers is possible usage of DLSS and ray tracing, both of which only affect the newest games out, if they happen to have those affects coded. Doesn't affect even slightly older games as they don't have it. The other advantage comes in 1440p, the 2060 is slightly stronger than the 1660ti, but for most games you are talking 5-10fps on average. Unless you are a benchmark chaser, that's not anything you'll visibly miss. If at 60/75Hz, most games are so far past that fps, even minimums don't apply, so game play is identical. At 60Hz, doesn't matter if minimums are 100fps or 500fps, you get 60. Nobody can tell the difference between 130fps or 140fps by looking at a monitor. Only the benchmark fps counter can.
A gtx1660ti or rtx2060 only requires 450w psu. The Seasonic Focus 550w is plenty, even with OC. I've been running a i7-3770k OC 4.6-4.9GHz with a gtx970 OC 124% for over 6 years on Evga 550w G2 without issue. Both cpu and gpu demand more than a Ryzen 2600/2700 under OC and a 1660ti/2060 under OC. You'd be lucky to see a 400w draw under heavy gaming.
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