Impossible to answer, really. Hauppage uses tuners of different models by several manufacturers (mostly Phillips) so your mileage may vary slightly.
I have two hauppage PVR150MCEs, both with Phillips tuners. One is ever so slightly noisier than the other. Both are simply amazing in video quality -- switching from viewing the Hauppage card output on the TV to the TV tuner is a perceptible difference in favor of the PVR150 cards. And I used to think our new generation TV tuner was good.
My next door neighbor has an older generation all in wonder card. It's also not bad, but I'm not able to compare apples to apples on the same TV with the two. But remember, you can use the discrete PVR150 in a different machine or after you upgrade/downgrade your video card. Something you can't do when it's glued onto your main graphics card.