Topic: 8x GPUs hashes less if put all together (Read 291 times)

Gotcha.

Mine is a reasonable amount. Not big but significant enough especially having 8 cards.

My expectation is that my total hash would be >240 Mh but i'm just doing around 236 Mh now.

First-world problems, maybe but 4Mh is 4Mh.

And seeing your beloved cards hash above or just around 30 brings utmost satisfaction. 

0-2 h/s drop very minimal and fluctuating which i guess is normal and at least no changes compared to eth.

By minimal, please do tell how much hash rate is lost?

Guys, I also experience this, but when I do mine other algos like XMR drop hashrate is minimal, I am thinking that it has a relationship with the dag creation, what do you think?

I had a similar experience myself, I'm using 6x Sapphire RX580 8GB Pulse. In the beginning, I tweaked each and every card solo to get it's best settings and wrote down all the tweaks that I've done on a piece of paper.
After completing all 6x GPUs, I ran them together at their best settings and I saw 2-5% drop in their hashrate from their best solo settings. It's been months now and I've never found any solution to this.
From that point of time, I never went tweaking GPUs solo. So, I want to say you're not alone!

Okay, I have this problem that's been baffling me for couple weeks now.

Let me start with my system components:

Biostar BTC Pro
G3900
4GB Corsair
120gb SSD Sandisk
2x 850w Thermaltake Toughpower Gold 80+
8x MSI Gaming X Rx580 4gb Elpida
Claymore v10
aug23 blockchain drivers
Win10 Pro 64bit

Now that's out of the way, lets start. Initially, i put them in pairs then tweaked the cards to see maximum potential hash rate. I'm using a custom strap and I was able to push the cards to 1140/2025/875 with <10 memory errors running in about 12+ hours. So that's all good and shiny right? Yes, that's what I hoped too.

This happened with 3 other batches of twin pairs (2 per session) so in the end, I was able to tweak all 8 cards. 7 of them can do 30.1 up to 30.4 and only one managed a maximum of 29.9 doesn't matter what I do. This card has the lowest asic quality of all (71%). The 7 other cards have >76% asic quality.

Onto the interesting part - when I connected all 8 GPUs to the BTC Pro board they won't hash above 29.5  . I am very frustrated by what happened as I spent many nights tweaking each and every card to its max potential only to be faced with the reality of they won't even give me a solid 30 - not one of them!

Does anyone have similar problems like mine? Any help would be appreciated!

I'm starting to think that this is a Windows limitation, as i've yet to see someone who has 8 cards hashing >30Mh per card. Or it could be hardware limitation as well? Should I put in more RAM?

Thanks in advance.