Short answer: No
The 750Ti will generally be ok for either older games at 1080P, but would likely only be ok at 720P for most newer games
You can see some idea of it's relative performance, and what graphics cards are recommended for 1080P here:
NVIDIA AMD INTEL Tier - Suggested Resolution/FPS RTX 4090 Tier A - "Elite Tier" RTX 4080 Super RTX 4080 RX 7900XTX RX 7900XT Tier B RTX 4070Ti Super RTX 3090Ti RTX 4070Ti RX 6950XT RX 7900 GRE Tier C RTX 3090 RTX 4070 Super RTX 3080Ti RTX 3080 (12GB) RTX 4070 RTX 3080 RX 6900XT...
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In terms of the G4400, it's a bad choice for most games nowadays, as it's only a 2 Core processor, and doesn't even have hyperthreading (2 extra "virtual" cores)
If you already have the G4400/motherboard, you could try and source an i5 6500, which is a 4 core processor that will be compatible with the motherboard, and would be a much better processor:- however they aren't worth more than about £30, as arguably spending more than that, is money that would be better put towards a newer motherboard/CPU.