Question Underperforming GPU

[Rixtero]

Heya!

I've recently bought a second hand GTX 760 for my sister, but I wanted to test it out on my pc first. I'm rocking a GTX 970 MSI 4G. I benchmarked it on cinebench and it gave me 90 FPS. I switched it out with the 760 and it still gave me 90 FPS. Surely, this can't be right. I mainly play CSGO, so when I launched danger zone I got unstable 40-90 fps with the 970, and with the 760 stable 100-120 FPS. Here's my PC:

RYZEN 7 1700 OC @ 3,3 GHz
ASrock AB350 PRO 4
8 GB RAM
128 GB SSD & 500 GB HDD
700W PSU (Gigabyte B700H)
Geforce HAWK GTX 760 2G / Geforce MSI GTX 970 4G.

I haven't OC'd my GPUs.
I have updated the drivers to their latest patch.
I haven't tempered with the game's settings or their physical form.
They are both second hand, but I expect the 970 to be 2 years older.

If anyone knows why it's performance is lower than a theoretically worse card, please let me know.
Thanks!

EDIT: I've also tested a third card, an AMD radeon HD6670 (very shitty card) and that gave me an expected 30 fps cinebench and 15 FPS danger zone game.

 

[superninja12]

Wrong game man, all source games and most other mobas/rts games are heavily cpu bound.

 

[Rixtero]

Wrong game man, all source games and most other mobas/rts games are heavily cpu bound.

I know, but I used to run an i5-6400 and it ran about the same as it does now, while clearly the ryzen 7 1700 is much better. Also I'm not just talking about in game performance, as the cinebench benchmark shows these cards are on par, whilst they shouldn't be at all.