I have a question should I buy a wallmart pre-built then give it a few upgrades?

[GGingerbread]

Title
In short I have a low budget for a new pc and my current *laptop* is i5-8265u with inagrated graphics aka GARBAGE

[dizmo]

Hard to say when you don't give us a model you're looking at.

[TeraBot452]

the 8265u isn't that bad of a CPU.  In fact it is faster then most of the i7's from the kaby lake-r lineup.  If your computer is not a HP or Lenovo you should look into eGPU's for gaming because your cpu is very decent.  Although I would recommend undervolting using throttlestop which will give you 10-20% more CPU performance.  I used a system with a 8250u and a UHD 620 which linux for YEARS and it was amazing(after undervolting and optimizations within linux ofc) I only recently upgraded when I snagged an i9 10900 for $200

[The L2d]

Without knowing what model it is I'd say yeah, if you don't like the case you can always replace it later and if the PSU starts giving you issues just buy a new one. Honestly the parts in there are going to be "alright." I would also immediately buy an NVME (if your motherboard can take it, you never know with these Walmart specials) and install a fresh copy of Windows or whatever flavor of Linux you like. 

[TeraBot452]

1 minute ago, The L2d said:

Without knowing what model it is I'd say yeah, if you don't like the case you can always replace it later and if the PSU starts giving you issues just buy a new one. Honestly the parts in there are going to be "alright." I would also immediately buy an NVME (if your motherboard can take it, you never know with these Walmart specials) and install a fresh copy of Windows or whatever flavor of Linux you like. 

with my experience if its intel stay far away, not because intel is bad but manufactures use intels specification for power (I personally use an intel system) which means that youyr cpu will be 40-60% worse then if it was in a DIY motherboard.  for example my 10900 with a 65 watt power limit enforced (intel limit) cinebench goes from 6100 points to 3400.  And in games I lose 10-20% (Asrock Z590 Steel Legend)