you can use fastest gddr AF22 modules like on FX5900 series cards. 850Mhz.
I not sure the chip can provide such fast clocks, but, you can try.

they're compatible with DDR modules installed on 4200 card.
i have installed this one on my 980xgl card in stock clocking mixed with default one.

What is your old RAM? Can you post a pic?

dm- wrote on 2025-01-29, 08:14:

you can use fastest gddr AF22 modules like on FX5900 series cards. 850Mhz. I not sure the chip can provide such fast clocks, b […]
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you can use fastest gddr AF22 modules like on FX5900 series cards. 850Mhz.
I not sure the chip can provide such fast clocks, but, you can try.

they're compatible with DDR modules installed on 4200 card.
i have installed this one on my 980xgl card in stock clocking mixed with default one.

Thank you for this.

I have a couple of FX5900 cards with core issues so if I fail to fix them, I’ll scavenge the modules from there for my GF4.

ChrisK wrote on 2025-01-29, 08:26:

What is your old RAM? Can you post a pic?

Here's the pic.

Do I need to change anything on the board of the GF4 Ti 4200 if I change to a different brand of memory such as the one listed a couple of post above? (I've seen YouTubers change straps for new RTX cards when they change the brand of memory on the board)

just swap

byte_76 wrote on 2025-01-29, 10:44:

ChrisK wrote on 2025-01-29, 08:26:

What is your old RAM? Can you post a pic?

Here's the pic.

Do I need to change anything on the board of the GF4 Ti 4200 if I change to a different brand of memory such as the one listed a couple of post above? (I've seen YouTubers change straps for new RTX cards when they change the brand of memory on the board)

On Radeon cards (I know of 9xxx and first X-series) there are straps for different RAM manufacturers. Don't know what they do, maybe change some fundamental RAM timings or the like and also don't know if that is something to care about on nvidia cards.
My reason for asking for the photo was determining the RAM type used on your card. My Ti4200s use TSSOP DDR. The fastest you can get there is commonly 4ns. Some manufacturers also made 3.6ns but those are very hard to get and also need higher Vcc. So swapping, if making sense at all speed-wise, would also have meant changing/increasing voltage.
But yours is BGA. They do go quite a bit faster than TSSOP. But they are also more difficult to change. If there's an error with soldering at one chip you will hardly know which one needs rework.

Regarding the voltage you're in luck. Your old 3.3ns RAMs should already use 2.8V (same as the 2.2ns mentioned above) whereas the 3.3ns variant of hy5du283222af would have used just 2.5V.
So in theory a swap should be possible.

Great, thanks for the feedback. It looks like I'm good to go then. I just need to get hold of appropriate memory modules.

So far I've found the HY modules above on Aliexpress but the cost is quite high so I'm checking if there are other options. (The modules alone are almost the cost of another Ti 4200)

Interesting mention of straps on Radeon 9xxx cards.

I have a Radeon 9700 TX (non-pro) in working condition which would be awesome to clock at Pro speeds by flashing a Pro Bios..
I’ve tried overclocking it and found that the core runs fine at 325 MHz but the memory can’t get past 280 MHz and isn’t entirely stable at 280 either.

Replacing the memory with faster modules might be an option but I’m still learning and would be reluctant to potentially ruin a nice working and somewhat scarce card like the 9700.

I wonder if anyone has done that upgrade to their 9700 non-pro.

I received the replacement modules and went ahead with the swap.

The card now displays the initial description at power on without any artifacts but the memory size indicates 64MB instead of 128MB and the screen just goes black after that without turning off the monitor. Like the card doesn’t initialize properly at POST.

Is it likely that there was an issue with the soldering or could this be an issue with the video bios or maybe some sort of straps?

The card had 8x Samsung modules before (4x front, 4x rear) and now it has 8x HY5DU283222 AF-22.

It is challenging to replace all 8 modules because, to do the modules on the front, I can mount the card onto the pre-heater and easily solder the new modules, but for the rear modules, facing the card downwards with the caps facing the pre-heater would be problematic, so I use only my hot air station and this requires more time and more heat to melt the solder.

How do you usually tackle the challenge of desoldering and soldering the rear modules?

Not sure if this is worth the effort. Maybe if you go one-by-one chip, and test every time. Balls may be connected underneath. Maybe you can locate problematic chip if it is overheating. It may also be something else. Memory controller on 9700 is quad-channel, so you have 2 channels not working? You'll need fresh set of chips or reball existing ones if you desolder.

stef80 wrote on 2025-03-11, 12:13:

Not sure if this is worth the effort. Maybe if you go one-by-one chip, and test every time. Balls may be connected underneath. Maybe you can locate problematic chip if it is overheating. It may also be something else. Memory controller on 9700 is quad-channel, so you have 2 channels not working? You'll need fresh set of chips or reball existing ones if you desolder.

The card that I’m working on is a Geforce 4 Ti 4200. It has 4 chips on the front and 4 on the rear, which should add up to 128MB

At this point I’m not sure what the issue might be so I’m considering removing all chips on one side of the board and reballing. After that I’ll test again and then repeat on the other side if the problem remains.

If that still doesn’t resolve the issue, I’ll cut my losses and use it as a parts card.

Remove 1 chip on one side, if it's still 64MB, that's the side with the problem, if it's no go, that's the side that was working

front side of the card is the first 64mb of ram (64bit wide)
back side of the card is another 64mb of ram (adding 128bit support)

if any memory module on the back side was soldered not properly, card will go to 64bit / 64mb

it is ok to reflow the chips by heating and "moving" the chips to make sure all balls are soldered properly. just add a little flux