News Geil Unveils DDR5 Memory Modules with Tiny Fans

how about just doing vapro chambers for ram? least they don't wear out like fans ;/
A fan dissipates heat off the component through the air (convection). A vapor "chamber" is a large [comparatively to heatpipes] volume of water used to move heat from one place to another (a heatpipe is a vapor chamber also). Vapor chambers are part of a passive cooling solution. They can more efficiently utilize/engage a thermal mass (heatsink), but they still fall within the thermal capability of the heatsink size/design and its ability to passively radiate heat.

For small elements like sticks of RAM, a heatpipe is really the most appropriate use of a vapor chamber. The issue (as seen below) is that RAM slots are pretty close together. So you're still relying on thin heatsinks pressed against the chips to get heat up to the heatpipe in the first place. For that same reason, a "vapor chamber" on the sides probably isn't physically possible. Also because the heatpipe is located a fair distance away from the heat source [RAM chips], it has limited efficacy.
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Ultimately I'd say a RAM slot cooler is more effective and replaceable than putting fans on each DIMM.
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tiny fans are going to need to spin fast and fast spinning fans are noisy.

Would be better as alceryes says an put a better heatsink (with TIM). If the case has good air flow then cooling is not a problem.
They don't necessarily need to spin fast. It's not not like RAM is pumping out a lot of heat to begin with. Performance RAM typically doesn't draw more than a few watts per module. DDR5 does move some additional circuitry onto the modules, though I doubt it makes much of a difference as far as heat dissipation goes. To improve cooling, the fans really just need to move a small amount of air under the heat spreaders.

Of course, it's questionable whether any of this is needed. A lot of modules that add heat spreaders don't even technically need them, but add them because they look nice, and can justify higher prices for a minimal increase in manufacturing cost. And of course, the lights on RGB RAM are just there for looks, and if anything, add a small amount of heat, counter to what would make for an effective heat-spreader design. Likewise, I suspect these tiny fans are more about giving the product a "premium" look to justify higher pricing than something that will actually be all that useful. Similar or better results could have likely been achieved just by leaving out the RGB and adding some addition fins to the heat spreaders.

It might be interesting to see a review of this RAM that tests the effectiveness of the fans, and whether or not they allow the modules to be overclocked to any further degree, or otherwise allow them to remain within safer temperature limits, by turning them off, or otherwise blocking them from spinning. Tests would need to be performed in configurations with both minimal and high case airflow, with the system heated up, as well as with the RGB enabled and disabled. Maybe even test without any heat spreaders at all, and with them swapped for a set off some budget RAM to achieve a baseline.