Measure the diameter of the fan and the hole distances between the screw mounting holes. Search for it on Aliexpress long enough, and you're sure to find something.

If you want to go almost silent, a Zalman ZM80D-HP will fit both of those cards. A 9800 definitely needs to be paired with an additional fan though (which can run at low speed).

The Zalman ZM-OP1 is the "official" solution and will fit perfectly, but any other fan would work, too.

Both of these can often be found on eBay.

I put a Zalman ZM-OP1 on my original radeon 9800 back in the day. It worked and was quiet, but it is certainly something you want to keep locked away in a case. Those sandwich heat pipe coolers seem a little fragile to handle in a test lab environment.

there is a plenty of cheap pci-e cards fitted with zalman coolers, like gigabyte 1950, 9600gt, etc..

these Zalman coolers works pretty well with 9800.

Well, I wouldn't say there are plenty of these and also not really cheap. At least around here.
But there are similar alternatives on aliexpress:

They cost around 10 Euros and should fit most of those "classic" cards.
I haven't used one of those on my own yet but I think another user here, tehsiggi, already recommended them (Re: VGA Repair report collection).

However, these have the same drawbacks as the Zalman has, they are a little bulky and not really usable for frequent handling, imho.
I have one of these original Zalmans on a 6600GT and it has a little play on the die (makes full contact but can be twisted a bit) which makes it feel ...mmmmmhh.

For a Ti4200 there's also the Deepcool V65. But this is also quite hard to find.

ChrisK wrote on Today, 09:15:

Well, I wouldn't say there are plenty of these and also not really cheap. At least around here. But there are similar alternativ […]
Show full quote

Well, I wouldn't say there are plenty of these and also not really cheap. At least around here.
But there are similar alternatives on aliexpress:
They cost around 10 Euros and should fit most of those "classic" cards.
I haven't used one of those on my own yet but I think another user here, tehsiggi, already recommended them (Re: VGA Repair report collection).

However, these have the same drawbacks as the Zalman has, they are a little bulky and not really usable for frequent handling, imho.
I have one of these original Zalmans on a 6600GT and it has a little play on the die (makes full contact but can be twisted a bit) which makes it feel ...mmmmmhh.

For a Ti4200 there's also the Deepcool V65. But this is also quite hard to find.

Been using these on 9700s and 9800s as well. They also fit on a Ti4200. For their price, they are good value.

douglar wrote on Today, 02:20:

I see some affordable square 55mm heatsink fan combo’s from china, but I’m not sure they disapate enough heat.

Those smaller ones, like on this picture? They've been the default coolers for Sapphire X700 GPUs, to put them into perspective. I wouldn't use them on something like R300/R350 based for too long.

I use the $10 Aliexpress cooler that ChrisK posted on my Ti4200. It fits perfectly.

It cools fine, but at least on the two that I ordered, the fans were way too noisy so I had to replace them with something quieter.

You will lose at least one PCI slot to the thing, though.

jh80 wrote on Today, 09:44:

I use the $10 Aliexpress cooler that ChrisK posted on my Ti4200. It fits perfectly.

It cools fine, but at least on the two that I ordered, the fans were way too noisy so I had to replace them with something quieter.

You will lose at least one PCI slot to the thing, though.

They look like anodized aluminum instead of copper, which is fine. I didn't expect copper for that price. Aluminum is good enough for the generation of card that I'm looking at. They look pretty nice, especially for the price. I should probably order one. Sucks to hear that the fans are noisy. Hard to find good fans at a good price any more. What fans did you replace them with?

I didn't mind the 2 slot lacey coolers back when I'd put them in a case and won't take it out for a year. But my "use case" these days is to take a card out of the storage rack for a week, play with it on a desk and then put it away for 6 months. It's easier to store single slot cards and those lacey coolers tend to snag on loose cables when you move stuff around. I might go with something like the Titan TTC-CUV3AB Copper VGA Cooler, if aerocooler.com is still really in business.

Edit -- Interestingly newegg still has some quality looking heatsinks available through their market place, but I probably need to stick to the "2-pin" power

K60 Graphics Card Cooler Graphics Cooling Fan 60mm Quiet Desktop Video Card Heatsink GPU Radiator
K80 2 copper heatpipe copper plating heatsink Graphics card cooler
K81 Graphics Card Cooler Graphics Cooling Fan 80mm Quiet Desktop Video Card Heatsink GPU Radiator
K91 Copper plating Graphics card Cooler ATI Graphics Cooling Fan 90mm

The "fan" coolers on new egg look like the base is made of "pressure welded" fins instead of whatever that is on ali express.

Surplus sales seems to have what I'm looking for---- Doesn't look like they will be running out soon.

Dont buy the Fans ChrisK linked. I buyed two of them and they are useless because of Bad screw holes. Unusable.

AncapDude wrote on Today, 15:42:

Dont buy the Fans ChrisK linked. I buyed two of them and they are useless because of Bad screw holes. Unusable.

n=2 anecdotes are a bit short lived. I bought 4 of them and they were all fine. What are we going to do now? Let's just say don't buy them in bulk, try one and if it works, you're happy. If not, open a dispute and that's it.

douglar wrote on Today, 14:47:

Surplus sales seems to have what I'm looking for---- Doesn't look like they will be running out soon.

Nice find. I hope those work.

Regarding the Aliexpress one: I should say I'm more concerned about noise than average, so perhaps others wouldn't mind the fans, but the two I got were unreasonably loud. I didn't have a good solution so I just did a hack-job and zip-tied a 40mm noctua fan to the heatsink. Looks bad, probably doesn't cool as well, but makes almost no noise.