"Total Design Power" to be picky, but the term has gotten a bit generic and is widely misapplied a bit in usage - and yes I'm guilty of that myself.

 Good way to kill TOR for 30 seconds or so at a time, unless they've ramped their network capacity up a TON since I last looked at them.

Using SATA connectors for risers is a BAD IDEA, SATA connections are not rated for the 75 watts (nominal, sometimes HIGHER) that a common GPU pulls from the PCI-E bus.

 I'm not sure but I think that's one of the spaces I was looking at to move into a year back, when I relocated to Washington from Iowa.
 Same complex anyway as one space I looked at.

NVidia has never had their own fabs.

 AMD sold off their fabs a while ago - those fabs (along with the ex-IBM fabs) are now part of Global Foundries.

 At this point, for cryptocoin mining purposes, the only chip makers that really matter are GF, TSMC, and possibly Samsung, as Intel doesn't tend to sell out fab capacity to anyone less than an Apple (and that's more that Apple is using Intel CPUs and chipsets that they get at a bulk discount than that Apple is actually using Intel fab capacity).

 

GTX 750ti (which is Maxwell generation like the 9xx series) is still one of the most efficient Monero GPU miners.

 Probably not to a significant degree.

 It's Equihash, so EWBF or DSMB (sp?) on the Nvidia side, Claymore on the AMD side, should all work just by pointing them at a BTG pool with a BTG wallet address.

You CAN mine with older cards - and some of them are still profitable if you have low enough electric cost, like my R9 2xx and HD 77xx/78xx cards and my NVidia 9xx cards.

 You do NOT need "the latest" to be able to mine properly - they're just less efficient and less likely to be profitable.

My Aorus testing is mostly done on my Win7 gaming rig (where one Aorus lives and I can use Afterburner for easy manipulation) on the "base" model Aorus 1080 ti.

The rest come from my XUbuntu mining rigs - though EthOS should be able to match those numbers since it's also Ubuntu based.

 Try plugging the card directly into the 16x without a riser, since you're not using anywhere near all of the slots anyway?

 I haven't tried booting the board with no card in the 16x, that might also be an option to just ignore that slot.

 It's going to depend a LOT on where you set the card and if you are aiming for max efficiency (I can see over 4.1 sol/watt with EWBF on my Aorus or Windforce 1080ti cards at +100 core +150 memory 150 watt TDP for about 620 sol/s) or for hashrate (Aorus can hit 780 sol/s at 250 watts, and over 800 at 275 watts) or for something in between.

 For the AMD side, Sapphire is "the one" - they have no real competition. I WISH they made NVidia cards.

 For Nvidia, I'd say EVGA and Gigabyte though Zotac is doing OK so far - EVGA at least responds quickly when they DO have an issue (like the early 1070 cards with overheating issues if you used the stock fan profile).
 I have had issues with XFX and stopped buying them years ago - they may have gotten better since then.

 Some altcoins aren't GTX 1080ti friendly.

 Note that OP has some AMD cards in their "showoff" rig.

 No clue what you mean by "the fan is on +1" - it sounds like you set the fan to 1%, which is NOT going to cool the card at all.

 What are you using for fan and OC control?

There is no "fixed calculation" to figure out your rewards for a given card - it depends on which project you work on, how many other folks are earning Gridcoin via that project, and how well your card does on that project.

Due to the nature of how BOINC calculates RAC (which is the basis that GRC uses to figure it's payouts) it also takes about a month for your earnings to ramp up close to full once you DO get started on a project.

 Speaking to the Moo Wrapper project specifically (where most of my efforts are concentrated for non-GRC reasons), a single RX 480 should get to ballpark 550,000 RAC by the end of a month - as of right now that would earn about 17 GRC a day which is worth 60 cents more-or-less right now.
 These figures change though, as folks switch projects and new folks get involved and existing participants leave.

 The RX 470/480/570/580 are some of the best cards to use on this particular project - their closest NVidia equal is the GTX 1070, which has about the same keyrate as a 480/580 for quite a bit more $$$ but about the same power usage.
 This project also works quite well on older pre-GCN AMD cards, unlike many cryptocoin mining programs. and is efficient to run on the iGPUs that AMD puts on their A-series CPUs.


 Other projects will vary a lot - Milkyway for example needs good FP64 (dual precision floating point) performance, so it's very partial to the older AMD Tahiti-based cards like the HD 7970 and R9 280 / 280x while NOT working nearly as well on the current Polaris-based cards or anything NVidia short of the pre-Pascal generation Titans (there also appear to be some driver issues that make the older Titans that SHOULD work better on Milkyway somewhat less effective compared to the Hawaii AMD cards).
 For comparison, the R9 280x on Moo Wrapper is a little LOWER performance than the RX 470 (I have some of both working in Moo Wrapper).


 Realistically, you don't work with GRC to maximise your profits out of a card, as a general rule there are more profitable options.
 You work with GRC because you WANT to do the research and it makes it less expensive for you if you work on GRC-supported projects.

 Titans have pretty much the same performance as the GTX 1080 ti - total waste of money to do cryptocoin mining on them unless you already HAVE them for some other reason.

 Direct quote from the Bitcoin Gold website:

 "Bitcoin Gold implements a new PoW algorithm, Equihash, that makes mining decentralized again."


 Which is kind of a lie since Equihash is the same algorithm that ZEC and ZEN (among others) use, NOT a new algorithm - unless they are going to impliment a modified version that's not compatable with current mining software.


 I like the EVGA cards I have, my current tentative planning involves some of their 1080ti models that don't have 2 x 8 pin power connectors for my future expansion (2 x 8 pin is a nightmare from a power supply standpoint for my planned rig expansion).

You probably have your fan profile as default, or the fan speeds set too low.

Tried it on my gaming box today - single 1080ti.

 725ish sol/s vs EWBF at 760ish with the same settings.

 Might try it on one of my boxes with 1070 and 1080 cards later today, but so far I'm not seeing any reason to switch.

 I do prefer the "don't use dark colors on a black background" aspect of the interface - I HATE the default color choices Claymore and EWBF use on their miner programs that make them hard to read on a lot of my monitors.