I'm now using two 750 TI's on a motherboard with PCIe 1.0, one is sitting on a x16 slot, the other one on a x4 slot (IIRC, the equivalent of a PCIe 3.0 x1 slot), I have no bottleneck if I run all my mining with '-H 2'. I'm reaching the same speeds as everyone else here, roughly 310 to 320 kh/s scrypt or 160 mh/s kekkak with moderate overclocking. Without the '-H 2', I go straight to 250 kh/s or so in scrypt.

(hash rates quoted are for a single card, and both reach the same figures with -H 2)

Cheers,
Myagui

Edit: Will check & report on my bus usage tonight.

To those finding 0 payouts from the pools:

Get your wallets updated! You're stuck on block 500...

Cheers!

Who would be willing to promote HXC around the relevant (non-crypto) communities?

One way to draw value to the currency, is to bring in new users/miners/traders that relate to the Helix Fossil and grow our numbers. With so many new coin launches recently, it's not easy to get HXC widely noticed.

Cheers,
Myagui

Correct. Helped me with 750 TI, but no changes with 770 for example.

Just to add that I too have a similar experience, with the latest & greatest release from today (and also around Max release). I'm seeing the same 40% less hashrate reported by the pool with Helixcoin. Nothing seems to change if I setup separate workers for my GTX770 & the GTX 750 TI, or if I keep them on a single launch command.

The only thing odd that I've noticed, is that the hashrate reported by the pool get's closer to the value reported by Cudaminer, when higher Vardiff kicks in (at say 128). At Vardiff 32 & 64 the discrepancy is much larger, and it's not a case of just the expected variations in share findings or luck, as I see the same hashrate reported over long periods of time (as long as the Vardiff remains the same).
Is it possible that the "changes" or "fix" that you worked on shortly after the Maxcoin launch have left some gremlin vestiges? 

PS: Again an awesome bump for the 'green team' with that latest update with the hand from nvidia. Big thanks for the update Christian. I'm surely going to donate as soon as I'm fortunate to get a break on a new coin/algo launch.
Cheers!

Can't wait to try that out on my 750 TI, would be awesome to have this for the Helixcoin launch tonight!!!

Each of the algorithms runs separate difficulties & miners, so it's as if it was not 1 coin, but 5 different coins all sharing the same rewards.
In other words, you'd need to add cuda support for 'groestl' only, and we'd have the 1st & only gpu miner for that algorithm.

On a completely unrelated topic: do your 'pals' over at nvidia give you any hints on launch dates for the high end 800 series? I'm greatly impressed by the 750's & 750 TI's, can't wait for the high performance (and super efficient) siblings to come about.

Thanks for the feedback though! Cheers!
Myagui

Christian, did you give a second thought to MYR? This is the coin with multiple algorithms running at the same time. A standalone miner w/source code was just posted for the one algorithm that is currently CPU only (groestl). Me smells an opportunity to sneak in with a CUDA blast!

Maybe I'm just being optimistic though, have no clue if 'groestl' would work out to be GPU friendly or not. The just posted x64 miner is netting me 265kh/s per thread on some old Xeon, and that is some 8x faster than what the wallet miner was reaching.

Sorry if being pushy. Just feel as though there's an opportunity for us to stand out as there is no AMD support for this one yet.
Cheers!

Edit: Here's the post with the standalone miner source & binary links.
https://bitcointalk.org/index.php?topic=483515.msg5413798#msg5413798

Yes, can be mined by everything, but the difficulty is adjusted separately for each algorithm. If there are tons of hash power going into 'SHA256' for example, the effective reward (per work invested) is much smaller for that algorithm specifically. If there is little hash power going into 'groestl', the effective reward per work invested in that algorithm becomes larger.

The fact that this coin supports a bunch of algorithms, suggests to me that it could see great adoption levels, and indeed it is innovating in the sense that instead of segregating a certain miner type (say, ASIC owner for example), it tries to bring all miners together as all platforms can generate meaningful rewards.

Note: It is mentioned in the announcement thread that 'groestl' is not a GPU friendly algorithm. I'm not saying that it is or that it is not, but I do remember some similar claims made by the keccak fellows a while back    

Christian,

If you're up for something new, I'd like to suggest MYR, which has an interesting combination of different algorithms, each with it's own difficulty but all at the same rewards level. Particularly one algo (groestl), is only mined with CPU/wallet at the moment, so possibly an opportunity for cudaminer to standout

https://bitcointalk.org/index.php?topic=483515.0
https://github.com/myriadcoin/myriadcoin

I'll be happy to test support for this on a GTX770 and/or GTX750TI (oh, but I'm unable to compile myself)
Cheers,
Myagui

Note that the reference card uses a single pci bracket, but internally on the case, the cooler height actually takes it into dual-slot territory. Me looking to buy 3x 750 TI's. Where are these damn things selling?! (Europe)

Just check the "howto" section at the ypool website, all there on the RieCoin section.
Cheers!

I'm also having a high rejection rate, but on my end, it's clearly just latency coupled with blocks being found too quickly... My shares get outdated easily :S

On another note, anyone working on a cuda implementation for riecoin? I'll be (very) happy to test and give feedback on any early version

cbuchner1: Awesome work on the maxcoin release. I will surely be sending over some coins when I get my internet back (bad weather here, just barely online via mobile). You make the 'green team' proud! 

Earlier there was a post about new/next cudaminer development opportunities, and I have two suggestions to make:

Protoshares - popular, highly valued, already has a gpu miner available (only binary I think), though it appears to be far from reaching optimal performance on nvidia, so likely opencl only at the moment. My single GTX 770 earns me a little over .5 PTS a day (1GH pool) and only using 70% power. (1PTS trades for 0.015BTC)

Primecoin - popular, currently CPU only (suspecting this one would prove to be a challenge in terms of optimizing for GPU at all, but perhaps cuda specifically would make it worthwile). It's not highly valued, but stable and also very popular. The potential on this one is for a GPU implementation to break into new performance figures, thus making it largely profitable for a relative time.

I hope this comes across as helpful. I would love to help with code but lack the skill-set, so instead I'm looking to save Christian's time in going through all the altcoins to work out the most interesting (or challenging) opportunities ahead. I'll be happy to to test any development version to support new coins, however broken or buggy a release is - but I only take binaries though

On Riecoin that was just mentioned: It's technically very similar to Primecoin, but yet to be launched. Interesting opportunity if it is found to reach a good coin value for the relative performance in GPU mining, but I don't see that it has the hype or following to produce the same returns as the ones I mentioned above (or even a fraction of Maxcoin for that matter).

Cheers!