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Corsair CX750M vs Corsair SF450
The Corsair CX750M is one of the very best PSUs that one can get for around $160. The Corsair SF450, however, while a very good choice in its own right, falls just a bit short of being remarkable.
No sources that do their own in-depth testing have considered the Corsair CX750M to be a good enough purchase for it to earn a spot in their PSU roundups, which is typically a bad sign.
As for the Corsair SF450, it was really well-received by reviewers at AnandTech, a reliable source that's known for conducting its own, high-quality, in-depth testing. It performed great in its "Up to 450 Watts& - Best PC Power Supplies: Holiday 2022" roundup and was named its "Ranked 2 out of 2", which, on its own, makes it a product that warrants a closer look.