how much power supply do i need for gtx 1070?
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Here is Guru3D's power supply recommendation: GeForce GTX 1070 / 1080 - On your average system the card requires you to have a 450~500 Watts power supply unit. GeForce GTX 1070 / 1080 SLI - On your average system the cards require you to have a 750~850 Watts power supply unit.
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NVIDIA has paired 2,048 MB GDDR5 memory with the GeForce GTX 750 Ti, which are connected using a 128-bit memory interface. ... Being a single-slot card, the NVIDIA GeForce GTX 750 Ti does not require any additional power connector, its power draw is rated at 60 W maximum. Display outputs include: 2x DVI, 1x mini-HDMI.
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SATA to 8-Pin PCI-E Adapter Cable – If your graphics card has an 8-pin connector but your power supply has neither 6-pin or 8-pin connectors then you can use this SATA to 8-Pin converter cable to power your graphics card. This power adapter cable uses two SATA connectors for one 8-pin power connector.
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A GTX 970 will still run a large number of games at max settings at 4K without AA at around 30FPS or higher. Considering you don't even want that and will settle for medium settings, a GTX 970 will absolutely be enough at 4K; you should be able to hit 60FPS in most cases at medium settings at 4K.
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GeForce RTX 2080 - On your average system we recommend a 600 Watt power supply unit. GeForce RTX 2080 Ti - On your average system we recommend a 650 Watt power supply unit. SLI - On your average system we recommend you add 275 Watts to the above values.
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['Motherboard.', 'Processor (CPU)', 'Memory (RAM)', 'Storage drive (Hard drive or SSD)', 'Graphics Card (GPU)', 'Power supply (PSU)', 'Cooling (fans, CPU cooler, etc.)']
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In the benchmarks above, though, overall the GTX 1660 Ti is the winner. It's as fast or faster than the GTX 1070 in the majority of tests, plus this highly efficient card is often more compact, quieter and more power efficient too.
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['CPU: Core 2 Duo @ 1.8 GHz or Athlon II X2 240.', 'RAM: 1 GB.', 'OS: Windows Vista SP2/ 7 SP 1.', 'VIDEO CARD: NVIDIA GeForce 6800 or ATI Radeon X1300 or Intel HD Graphics 2000 (512 MB VRAM)']
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It is always our recommendation that you buy cases with a minimum of 3 fans (or at least slots for adding them yourself) for gaming systems, not counting the power supply, CPU, and GPU fans. I know we say this about a lot of things (especially power supplies), but you really don't want to skimp on cooling.
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As a general rule of thumb though, for most gaming PC builds these days, you'll probably need to choose a power supply that has a wattage somewhere between 450 watts to 850 watts.
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Plug the 24-pin power connector into your motherboard first, then go for the 4 or 8-pin CPU power connector. Plug in the optical drives, SSDs, and hard drives. Finally plug any required PCI-E power connectors into your graphics card, then double-check all of the plugs to make sure they are securely seated.
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But even with several hard drives and a decent Intel or AMD CPU, a 600W power supply is sufficient for most single GPU configurations. For multi-GPU systems, we typically recommend at least an 850W PSU, with 1000W (or more) needed for dual GPU configurations.
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['Video Card: NVIDIA GeForce GTX 660 or AMD Radeon HD 7870 or equivalent DX11 GPU. Video Memory: 2 GB VRAM.', 'Processor: Core i5-7300U 3.5 GHz.', 'Memory: 8 GB RAM.', 'OS: Windows 7/8/10 64-bit or Mac OS Mojave 10.14.6.']
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['CPU: Intel Core i5-3470 @ 3.2 GHz / AMD FX 8120 @ 3.9 GHz.', 'GPU: GeForce GTX 780, GeForce GTX 970, or GeForce GTX 1060.', 'VRAM: 3GB.', 'RAM: 8GB.', 'OS: Windows 7 SP1, Windows 8.1, Windows 10 (64-bit versions only)', 'HDD: 50GB free space.']
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GeForce GTX 1660 - On your average system we'd recommend a 450 Watt power supply unit.
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Nvidia GeForce GTX 1080 Ti - On your average system the card requires you to have a 600~650 Watts power supply unit.
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NVIDIA RTX 2080 Ti: Minimum 650W. We recommend at least 800W.