Looking for some help with my new gaming build

the B450 and RAM should work fine.

You will want dual-channel ram, as it will make a marked difference

psu: I'd get a quality 550W PSU

3. shoudl be fine with the liquid cooler. Might even be overkill

4. airflow is fine, that cool air is moving in and hot air out is really the only concern. Positive vs Negative pressure is really a wash (We had a thread here about it for over 10 years, with over 5000 votes between positive pressure and negative pressure that was split *exactly* 50/50.

Looks good, I just went with a ryzen 2600 for my existing rx480 and definitely recommend it. So fast and I can do do much more at once now.

Don't buy that ram, get dual channel so if you want 8gb then get 4gbx2. I would recommend getting 16gb it's more now, but your set up for years. Gaming will benefit, 8 is a but close in some games. That model is fine just get 8gbx2. Search the motherboard list not the ram one. The motherboard approved ram list should be more accurate..

B450 is the way to go imo. It has so many good features. I have patriot viper rgb 3200mhz 8gbx2 with tomahawk b450 and the memory runs at 3200mhz no issues no complicated setup so b450 will handle the memory. Anything mid level 100$-130$ range from msi, Asus, gigabyte, asrock will get the job done and then some.

I can confirm a good air cooler will be more than good enough to handle this cpu. I went with the noctua nhu12-am4 and put a second random 120mm fan on the rear side.i oc to 4ghz and ran heavy benchmarks and avg temp of 58 with 60 as the highest it touched at any point. At stock all core boost of 3.85 it runs around 56c after hours of gaming with heavy usage. Non aaa intense games sit much lower. Idle is 29 normal use is like 40. Not trying to push this cooler they have others for less that will do just as good, but a good air cooler runs crazy cool. My cpu has never went past 60c in 3 weeks of heavy usage. 10m stress test was at 56c

My air flow is just how you are wanting and my temps are crazy low. I have 3 intake on front panel, 1 exhaust on top panel at the rear pulling out the top corner and 1 140mm normal exhaust. The heatsink sticks out in a perfect position to catch the air. The fans on heatsink are facing the same way as my front panel, I think this is what you are thinking of doing. So basically near my back top left corner I have 2 heatsink fans 1 pushing air thru the heatsink, 1 pulling air thru and then the exhaust about 4 inches from the rear heatsink pulling all the air out.

I would get a 600w psu bronze of higher and definitely get modular. Give yourself some room with the power. You aren't saving anything by dropping to say a 500w vs a 600w. I like corsair and evga a lot for power supplies, but you have tons of good ones available.

For gaming you will want a 500gv ssd anything smaller fills up too fast and you have to keep moving files. You can always add later, but if you can only pay a little more now to get a 500gb it's def worth it

Good luck

Oh, here is a photo if mine to reference the airflow. It sounds like you are doing something similar, but with 1 exhaust fan. That cooler fan is so ugly they are mailing me free what I need to use my own rgb in its place. Our cases are nearly identical, my front panel area looks dead on the same

http://imgur.com/gallery/8JmKQAs