>>106459789
>>TIL they removed the crab.
The RTL8125B (no G) still has it. Suspiciously cheap 2.5G cards on AliExpress and such are usually this chip. The original, large RTL8125 should be hard to find, which is good because it performs like ass and has compatibility issues (not as bad as early i-225V's, but still).

RTL8125 (large package, crab) >>106458690
RTL8125B (small package, low power, crab) pic related
RTL8125BG (also small, low power, no crab) >>106458677