Still not answering the question about why they aren't releasing the benchmarks already. Why would they not want to potentially take clients away from the 1070? You cant jsut say peopel will buy the 1070 regardless. That is not true and I am proof of that. I was goign to buy the 1070 but Now the Polaris is interesting but NO benchmarks so makes me wonder and might go ahead and buy the 1070 anyways now.
AMD likes to play their cards close to their chest, for better or for worse, and usually reveal peformance and/or features at launch date. Remember 480 vs 800sp final RV770 (4870) that made a joke out of GT200 (GTX 280) at half the die size and 90-100% the performance while consuming the same or less?
Eyefinity? Only a few key people developed that and got it included in the 5870, it was a secret until launch date.
Besides, it's been repeated ad nauseum and known that P10 doesn't target the same market segment GP104 does, so there's no point in comparing a card that has its competition in the GTX1060 (~980Ti -20-30%?), not in the 1070 (~980Ti) nor 1080 (~980Ti +20-30%).
Having said that, if you can't wait less than a month to see what's up with the option that will provide (as far as we know, this could change) around 80% (~390x/980) of the 1070's (~980Ti) performance at about ~40-50% the cost ($200 vs ≥$450, it's blower-scam edition with founder's-scam tax at first, then decent $380 custom cards later), then go ahead and get an overpriced early adopter 1070 if you must have a 1070 as soon as they go on sale. It's your money after all and you seem to have made your mind up already on this matter.
There could also be a suprirse in store that hasn't been announced since 2304sp/36CU sounds like a salvaged part, most likely there is a 2560sp/40CU "full" P10 card (beefed up 8GB edition?).
That card if available will get dangerously close to the 1070, if not being an equal in paper specs that could very well outperform it if GCN4's architectural changes are sound (2560sp at the rumored 1250MHz clockspeed for 2304sp P10 is around 6.5TF of theoretical compute performance, same as listed for the 1070). At the reveal AMD did mention $200-300 as the price range for Polaris, so there has to be something else at the $300 price point and below that. $230 is the 8GB RX 480, that's already known.
If you get 1070's performance for $300 should this card exist, it's a much better value vs $380 custom 1070 or $450 scam edition 1070. $200 RX 480 is already quite the value vs the 1070, if you have no need for the extra 20% performance it provides (1080p60 is the target here)
If I were you, I'd wait until the 29 for this very possibility and to see what the RX 480 is capable of in reviews, not speculation like this entire thread. This is GCN4 after all, and these slides certainly make it interesting:
Almost everything that's important in the GPU is labeled "new".