some reviews are fake, some reviews only offer those results after overclocking gpu, cpu and ram
gta v with the 650ti is viable, but only on medium setting,s that is low, gta v doesn't have a low value so medium is low, it is ok except for textures, textures on medium, low, looks very ugly, i know that because i had the r7 250 but the 2 gbs version and i played alot with settings to see how much i could get
no one is telling you here thy are trash, we are telling you that there are better options than a 5 year old gpu with 1 gb of vram no one should b using 1 gb this days, 2gbs is too little, i know that very well
yours is 3 year old used but the gtx 650 ti is 5 year old technology and will not support dx12 iirc, the r7 does support it
if your only options are those two, perhaps the strongest one would be gtx 650 ti, but 1 gb for gta v is a really bad gpu
if i was you i would try to get a gtx 750 ti 2 gbs or the new gt 1030 that is basically a gtx 750, but comes with 2 gbs of vram, a must this days
the reviews doesn't tell you how much it stutters, how bad the frametime can get and how ugly does look those games at 720p on low and how often the textures will fail to load or look weird while loading thanks to slow gpu and low amount of ram
it only tells you the average fps they got over a benchmark or playing 5 minutes a certain part of the game
gta v can be slow on city and have problems if the cpu is not fast enough, so that also matters, yours is a 2 cores only i3, the threads on gta might help but not much
try to find a better gpu with more vram, if you really can't find a better offer, do your best to find the gtx 650 ti but the 2 gbs odel, is hardder to find but it exist and is worth to get, other than that find the way to get the gt1030, it costs almost the same as those expensive gpus you mention
don't buy the r7 250, is slower than the 650