650W PSU

So i just bought the MSI HD 7970 Twin frozrlll. And I was thinking if my old PSU would work or not.BTW that PSU is from an unknown Chinese brand so do you guys think it would work? My system: Cpu: Core i3 6100 Ram: 2 sticks of 8 gb of ram DDR4 (16gb) SSD: 128 gb 2 HDD: 2tb and 1 tb PSU: arrow...

Hello, i have a buld wiht b450-m tuf + r 2600 + 16 gb + rx 470 4g. i have no idea which PSU one should i get ? - COOLER MASTER ELITE V3 600 W NO 80+ for $50 - SMART POWER SERIES 400W 80PLUS BRONZE for $34 - FSP Hyper 500W 80+White for $ 56 - THERMALTAKE LITE POWER 650 RGB NO 80+ for $ 56

This 650watt model of psu, https://www.thermaltake.com/products-model.aspx?id=C_00001860 I am confused should I buy this one or not. The official page says this series of psu is for energy efficient PC systems. And I didn't find any 80 plus certification on this psu. My pc specs: Intel Core...

People keep saying that DDR4 is faster than DDR3, it's more expensive because it's clocked higher in MHz. But here's the thing: Both of the standards have higher CAS latencies as they go up in speed. So something like DDR3 2133 CAS 9 would be faster than DDR3 3200 CAS 14 correct? So why do...