Marked almost exactly at rated speed. I have 5009/4443 MB per second in CDM 7.0.0 on X570 Aorus Ultra. For heaven's sake, don't try to use the built-in heatsink in combination with the m.2 motherboard heatsink (if you have one). One or the other! The included heatsink is thin. It's definitely bigger than a heatspreader and doesn't have the mass to act as a heatsink. It is simply stuck on with a thermal pad, it can be removed immediately without damaging anything. Keep it in its packaging and if you ever need an RMA (5 year guarantee!) just put it back in.
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