The Palit Jetstream has some good reviews. I'm struggling to see the difference between the two Palit models, apart from the £40 price difference. They both seem to have the same cooling arrangement, core and mem speeds, same outputs. Why the price difference I wonder? The name 'Jetstream' must be a clue. And, having dug into this further, I think the listed specs on the OcUK product page might be incorrect. A review of the Jetstream elsewhere lists it as having a 6-pin and one 8-pin power connector. The OcUK lists only "Power Input: 1x 8-pin".
https://www.overclockers.co.uk/pali...ddr5-pci-express-graphics-card-gx-044-pl.html
https://www.overclockers.co.uk/pali...ddr5-pci-express-graphics-card-gx-045-pl.html
The cheaper Palit on OcUK is the Dual, not the Jetstream. Those two do
not have the same cooling arrangement.
There are 3 Palit 1070 Ti models - Dual, Jetstream and Super Jetstream. The main difference is cooling - Dual is the worst, Jetstream is in the middle and Super Jetstream is the best. Dual has 1 BIOS whereas the others have 2 and it lacks the RGB lighting. Rather oddly, the Dual and Super Jetstream have only 8 pin but the Jetstream has an 8 pin and a 6 pin. No idea why the middle card would have the extra power connector.
You can confirm the differences at this handy comparison screen of all Palit models on their website:
http://www.palit.com/palit/vgapc.php?mid=2&subid=282&lang=en
Note that the Dual looks different to the Jetstream and Super Jetstream...and the picture on the cheaper one sold at OcUK is clearly the Dual (and wrongly labelled as "Twin X2", which isn't any Palit model).
The clock speeds are imposed by nVidia - every 1070 Ti must ship with the same clocks regardless of what the card is actually capable. Factory overclocked 1070 Tis are forbidden. If they weren't, then the Dual, Jetstream and Super Jetstream would come with different clocks from the factory (as they are for cards other than 1070 Ti). In actual use, you should get different speeds at stock anyway because the different levels of cooling should result in different boost levels.
Super Jetstream is basically Jetstream with better heatpipes, but you can't see the difference without disassembling it. Dual is a completely different cooler.
The Dual isn't a bad cooler, just not as good as Jetstream. Is Jetstream worth an extra £40? I've no idea - I can't find a direct comparison for the 1070 Ti models (and I think Jetstream and Super Jetstream are being confused anyway).
EDIT: I was wrong about 1 thing - on other Palit models, the Dual and Jetstream come with the same default clock speeds and the Super Jetstream comes with higher default clock speeds.