Can this PSU support up to 8 GPUs for bitcoin mining, and does it come with all the necessary cables?

Yes, this PSU supports up to 8 GPUs for bitcoin mining.

Is this power supply compatible with both 1800W and 2000W configurations, and how do I switch between them?

Yes, this power supply is compatible with both 1800W and 2000W configurations.

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1800W 2000W ATX BTC Mining PC Power Supply For 8 GPU PSU Ethereum Bitcoin Miner Machine 220V With Retail Box Drop Shipping

1800W 2000W ATX BTC Mining PC Power Supply For 8 GPU PSU Ethereum Bitcoin Miner Machine 220V With Retail Box Drop Shipping