SSD does not improve processing.

I googled, and found that r7 1700 4ghz nearly same power usage with r7 1800x. Both r 65w tdp and 95 tdp.
r5 1600 4ghz with 1.44v still consume about 20w less than r7 4ghz.
r5 1400 4ghz with 1.40v consume less than 1600.

May explain? cause i thought if similar  vcore, the power consumption is nearly same, but less core should lower power consumption than more core. as example of 1700 and 1800x, different tdp but didnt seems any big different when full load under ssimilar vcore.

Then a B350 will fit u in ur way.  In same range of price, why not getting best electric component a mobo has.
Gigabyte has best vrm quality overall among those brand, more stability and better component, as i know onboard audio of gigabyte is better in this range.
Anyway, u may consider other mobo that fit u for feature or maybe outlook color theme or aftersales service?

any B350 mobo                RM 450.00

(Quality of mobo, Gigabyte (4+3 with onsemi) > Asus (4+2 with onsemi) > Biostar (4+3 with sinosem) > MSI (4+2 with nicosem) > ASROCK (3+3 with nicosem, commonly better VRM give u better temp and stability when OC under high volt, still not recommended for OC 24/7 under 1.4v with ryzen 7 + B350 mobo, commonly give u about 100'c on vrm, got possibility toast ur mobo after long time run.)

This is the company name which production the mosfet which used on motherboard, commonly the mosfet cost more expensive, the better brand and quality it should be.

At higher end mobo as biostar gt7, asus crosshair, asrock taichi, commonly they use infineon or texus instrument mosfet. An the power phase controller will using better one.

Lower tier of X370 mobo, use onsemi which us company, sinosem which china company or nikosem which taiwan company, but they use more component and result you got more power phase for oc.

And at lower end of B350 range, commonly using nikosem or sinosem, the better one will using onsemi.

AM4 chipset support AMD upcoming APUs as well, those APUs have built in graphic chip so you can output display without graphic card.

DDR 4 8gbx2                    RM  650.00

(There's are cheaper 2133mhz DDR4 as low as RM140/8gb stick, but u need check is it in QVL of mobo u choose to better run will with ur mobo. RM650 is 3000/3200mhz 8dbx2 kit that commonlay well run in any am4 mobo)

I'm quite sure the Asus VRM uses better mosfets that are more efficient than Gigabyte which is using mediocre/low end mosfets, similar in quality with MSI in their B350 mb's. Asrock may only have 3 power phases for the cpu but it doubled up all the components so the VRM will probably run alot cooler which is important since heat seems to be an issue for 6/8 core builds.

https://youtu.be/ZGrxhf_xZWI
You don't understand what I said, see the video which was posted earlier by hairy.
Asus mosfets are better quality and so the VRMs will run cooler than 4+3 Gigabyte. The soc side VRM doesn't have to supply much power so it is relatively unimportant.
Asrock has 6 phases for the cpu side VRM, theres more than 1 method of doubling. The cpu side VRM will run cooler because theres more components to deliver the power.
According to the this german review,
"They run all quite hot, the gigabyte B350 Gaming is the worst, over 110 degrees with a 1800X stock. Biostar up to 100, Asrock over 80. Best ist the Asus B350 with under 80"

Users are reporting >110C ~1.3-1.4V with Gigabyte. 110C might still be within spec but thats not good since there are other nearby components which will be affected badly by high heat. Typically motherboards will throttle or shutdown at around 125C for VRMs.