Well depend on what brand you are looking at. For example the Sapphire cards from Radeon x1xxx series up to HD3xxx the cooler was total joke and scrub, i prefer every time other brands for the cooler. For example i have
That cards
https://imgur.com/a/3aZU1
Don`t mind the PCI ex cards they are only 2 of them all rest is AGP or regular PCI.
As you can see i have cards with superior cooling like ASUS HD3650 with that big cooler, HIS Radeon HD3850, MSI Radeon x1950 Pro. Only thing i can say from all of the 3 cards the ASUS is really poor, no matter it have copper heat pipe and big heavy cooler, still something is not right on that card, as i did have before Sapphire HD3650 AGP and the cooler was total joke, the fan is so thick (+ was broken and not spinning at all) the heatsink itself is some trash quality "metal" that have really bad feel when i touch it like plastic or so...
Now the interesting part is when i use the Sapphire 3650 and ASUS 3650 both have about the same temperatures in IDE they get hot at 60c while doing noting 🤣, most retarded thing was i did expect that ASUS cooler to be able to handle the card well without fans, but seems this is not the case.
This tests indicate the idle temperature of Sapphire HD 3650 AGP, one without fan and one with 80mm fan at not sure what speed was maybe 2-3K rpm. Take note the temperature did rise up after my shots up to 62c, also that temperature is identical to the ASUS HD3650 AGP as well....
Now about branding and cooler of AGP cards well i did have before also Sapphire x1950 Pro AGP and Sapphire HD3850 AGP, well the cooler was total joke i did sell them, after that i did find my precious MSI x1950 Pro AGP and HIS HD3850 AGP well they have great cooler on them, the cards never overheat no matter what, only - on HIS is the damn fan profile, as the fan is set waaay too low and the card gets hot outside windows, as the RPM is about maybe 1000 or even under that, but when i turn on the fan at more speed the card gets cold..
About why some cards, mobos and other have small heatsinks, or lack them, is the cost, as you can see the manufacturers have to lower the cost as they produce tons and tons of hardware and one simple thing like putting bad capacitors instead of japan ones, or using small heatsink and fan can result in really big impact on the manufacturing cost...
No you are wrong i believe Radeon and overall ATi cards since many many years was the one that did have superior image quality and better colors compared to nVIDIA cards. Also there is something very important the Radeon cards are all HD capable, that means even old cards like Radeon 9550 can run HD content like 1080P movies with the proper software and settings, while nVIDIA dies when you run HD content, nVIDIA did start to have HD support on the GEforce 8 series with nVIDIA Pure video, but that is far from the last AGP cards on GEforce 7 series.
I can play 30-40GB movies with the right codec, players and settings, will this on even GEforce 7950GT AGP will be impossible.....
Mah systems retro, old, newer (Radical stuff)
W3680 4.5/ GA-x58 UD7/ R9 280x
K7 2.6/ NF7-S/ HD3850
IBM x2 P3 933/ GA-6VXD7/ Voodoo V 5.5K
Cmq P2 450/ GA-BX2000/ V2 SLI
IBM PC365
Cmq DeskPRO 486/33
IBM PS/2 Model 56
SPS IntelleXT 8088