will this gpu work on a ASRock a320M/ac motherboard?

It would work, but do yourself a favor and go for a two fan card. I bought a new one of these about a year ago, and it ran at 85C and had to throttle itself to do that. The benchmark speed of the card was only 10000 when it should have been 11000, so it was easy to see that it was auto-throttling at 85C by design. If you carefully read the reviews, making sure that you are reading a review about this card and not the 1660 Super Dual card from Asus (the reviews are mixed together for some reason), you will see that this card just has a bad heat sink and runs way too hot. I immediately returned the one I bought after I confirmed the reveiws I had read. Best bet is a good two fan gtx 1660 super 6 GB or a two or more fan gtx 980 ti 6GB or gtx 1070 8GB. Those will give you very similar performance, but actually say 10% better...

will it fit in a dell 3880 with a sfx power supply?

Don't buy this card. It overheats in a good case. I tested one and had it in the mail a few short hours later for return. A good card for a smallish case is a zotac gtx 1070 mini. It's about 6.5 inches long (measure from the back of the case at the pci-e slot to see if there are any obstructions) and more powerful than the 1660 by a good amount. For that card, you will just need one 6 pin adapter from the power supply and then a 6 to 8 pin adapter, which sells for about $10. As long as your PSU is 400w, you should be fine. The 1070 uses 150 watts peak for comparison. I have one of these 1070s in a Lenovo. It's great...

Is this card compatible with a intel dh61ho motherboard?

Yes, however: 1) the video card requires power via an additional 8-pin PCIe cable from your power supply. 2) the card might not fit into the computer's case. One-fan model (Phoenix Series) Length: 6.85" (174mm) Two-fan model (DUAL Series) Length: 9.5 (242mm) [Logistics Notes] 1) The card is thick. The top PCIe x 2.0 x1 slot will be blocked. The card takes up 2 back-plate slots (but inside the case extends down about half a slot further). 2) The card is long. Using both/either of the motherboard's 2 SATA connectors should still fit with the video card, but make sure you have them connected before installing the card. [Compatibility] The reasons the graphics card and motherboard are compatible are: 1) Both card and motherboard are PCI-Express 3.0 x16 (and PCIe 3.0 is backwards compatible with even older PCIe 2.0 motherboards). 2) The card requires more power than what the PCI-Express slot provides, but gets this extra power from the Power-supply via a PCIe power cable. 3) The video card doesn't require any special motherboard chipset (or other) support. Have fun and take care!

Max Screen Resolution	7680x4320
Memory Speed	14000 MHz
Graphics Coprocessor	NVIDIA GeForce GTX1660 SUPER
Chipset Brand	NVIDIA
Card Description	GeForce GTX 1660 SUPER
Graphics Card Ram Size	6 GB
Brand	ASUS
Series	PH-GTX1660S-O6G
Item model number	PH-GTX1660S-O6G
Item Weight	1.7 pounds
Product Dimensions	6.85 x 4.76 x 1.54 inches
Item Dimensions LxWxH	6.85 x 4.76 x 1.54 inches
Manufacturer	ASUS
ASIN	B07ZGXG8GM
Is Discontinued By Manufacturer	No
Date First Available	October 28, 2019

GeForce GTX 1660 Super Overclocked 6GB Phoenix Fan Edition HDMI DP DVI Graphics Card (PH-GTX1660S-O6G)

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