$4k for a rig
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I got the 16x risers from http://www.hashratestore.com/
As far as manufacturers having the same exact hashrate, it’s not that simple. They all have minor differences if you look at the specs such as clockspeed, etc. Cooling or the lack thereof can be a big factor on how well electronics can operate as well. If you can’t keep them cool enough, good luck with OC.
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ok, back to the topic! *i’m guilty*
you have 4K to build this man a rig. how would you do it? ::) -
if the core and mem runs at same temperature it should be the same.
however some maufacturers like for instance gigabyte use
custom pcb with different layout of mem chips etcthis and the different quality/solution in quality cooling makes difference when
pushing the card 24/7.
oh and also the quality of some of the components (condensators,mosfets and such) may vary depending on how exact replica of original amd sketch is. -
[quote name=“deroekeloze” post=“7794” timestamp=“1369832768”]
[quote]Nope, nothing to do with the ram.[/quote]well, i stand corrected 8)
if you’re on windows, have you tried running the setx commands from a command window?
setx GPU_USE_SYNC_OBJECTS 1
setx GPU_MAX_ALLOC_PERCENT 100linux has similar commands but i don’t have them handy since i don’t use it :P
it’s wierd how hardware acts across the many variations out there
[/quote]here you go, this is what i have on the script.
#!/bin/sh
export DISPLAY=:0
export GPU_MAX_ALLOC_PERCENT=100
export GPU_USE_SYNC_OBJECTS=1 -
[quote name=“fher98” post=“7870” timestamp=“1369848855”]
[quote author=deroekeloze link=topic=936.msg7794#msg7794 date=1369832768]
[quote]Nope, nothing to do with the ram.[/quote]well, i stand corrected 8)
if you’re on windows, have you tried running the setx commands from a command window?
setx GPU_USE_SYNC_OBJECTS 1
setx GPU_MAX_ALLOC_PERCENT 100linux has similar commands but i don’t have them handy since i don’t use it :P
it’s wierd how hardware acts across the many variations out there
[/quote]here you go, this is what i have on the script.
#!/bin/sh
export DISPLAY=:0
export GPU_MAX_ALLOC_PERCENT=100
export GPU_USE_SYNC_OBJECTS=1
[/quote]i use all of those (both on windows/linux rig)
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I built a couple of these rigs about 2 months ago and highly recommend this guide:
http://www.cryptobadger.com/build-your-own-litecoin-mining-rig/
As a few others have said, the 7950 really is the best GPU for mining currently, and $4K is enough to get you three complete rigs (about 6000 Kh/sec).
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I really appreciate everyone’s suggestions!
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Any preference in the mining community here?
GIGABYTE GV-R795WF3-3GD Radeon HD 7950 3GB 384-bit GDDR5 PCI Express 3.0 x16 HDCP Ready CrossFireX Support Video Card
vs
MSI AMD Radeon HD 7950 3GB GDDR5 DVI/HDMI/2xMini DisplayPort PCI-Express Video Card R7950 TWIN FROZR 3GD5/OC
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Take the Gigabyte, three fans are better than two. Are you familiar with making powered PCIe extenders usually and mistakenly known as risers in the mining community?
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either brand is fine.
…still waitin on my msi 7950s to get here, backorder stinks. 2.5 weeks and counting… ::) -
[quote name=“justabitoftime” post=“8298” timestamp=“1369977033”]
Any preference in the mining community here?GIGABYTE GV-R795WF3-3GD Radeon HD 7950 3GB 384-bit GDDR5 PCI Express 3.0 x16 HDCP Ready CrossFireX Support Video Card
vs
MSI AMD Radeon HD 7950 3GB GDDR5 DVI/HDMI/2xMini DisplayPort PCI-Express Video Card R7950 TWIN FROZR 3GD5/OC
[/quote]Both are arguably the best cards on the market. However, the Gigabyte WF3 is (as far as I know) much easier to tune. I have ~22 of them. They are amazing.
Just make sure you do the F43 BIOS flash, and you’ll be hitting 660 KHs in no time.
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[quote name=“DigitalDoom” post=“8024” timestamp=“1369893669”]
[quote author=deroekeloze link=topic=936.msg7539#msg7539 date=1369760377]
[quote]you don’t really need a lot of memory[/quote]my personal experience with 7950s has been quite the opposite. my 7950 would not do anything over intensity 13 but throw hardware errors with 2 gig of pc1333. i swapped ram between rigs, throwing the 2 gig in my 5850 rig and 8 gig pc1600 gig into the 7950 rig. after re-running the setx commands on both boxes, the 7950 was able to do intensity 20 with no errors. this yielded about 100Kh bump in hashing speed and the 5850s continue happily onwards kickin out their 1.1Mh, 24/7. also with 2 gig in the 7950 box, i couldn’t run thread concurrency over 10K or so without cgminer throwing a nasty fit and calling me names. after the swap, TC set to 24K ran without a hitch. 5850’s TC remained at 8K with both types of ram, zero problems.
most of what i have read recommends at least 2 gig of ram per 7950, but a buddy of mine runs a few rigs with just 2 gig and has zero problems. it could simply come down to hardware configuration, karma, holding your mouth just right when assembling, or just plain old magic ::)
as with anything written on the internet, your mileage may vary 8)
[/quote]I use 7950s and they are the best card I could imagine. Can get >700kh/s with some tweaking. I’ve heard others complain of bad luck with 7950s and don’t understand it.
I do have one guess as to your problem…RAM! I have 10MB 1333 RAM in my machine that’s running 2X 7950s (Gigabyte). I’m willing to bet that most problems with 7950s can be tracked to low system RAM. Of course they can be sensitive to miner configuration too.
I will help anyone needing configuration advice…I think by now I’ve pretty much got the configuring part down to a science. Drop me a message if you need advice or assistance setting up a miner w/ a 7950.
[/quote]Then share with the group! Ive been playing around with a 6950 and got somre PSU issues. So got a new PSU and a 7950 (sadly still in the mail) but now I will need to tweak that too. Alsgo im planning on mixing the 6950 with the 7950… any command line suggestions?
thanks
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Ordered 2 Gigabyte (1 for myself and a friend) to get familiar with the mining process. Within 2 weeks, I’m ordering 16 7950s… this should be fun.
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Wow nice! Right now I’m running my 4 with a dual power supply setup. I have a 1250watt and a 800watt supply and running them as hard as I can for over 600Kh/s a piece. I have room and power for a 5th so debating. :)
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16? Holy shit. I wish I had that kind of money to throw around. Unfortunately I’m still working on saving up money to buy furniture. (Finally got a bed this month! :D)
I have 2 of the HIS cards. The voltage is locked at 1.25 unless you flash the firmware. They’re solid, averaging around 660kh/s at 1100/1500, but definitely loud and not great undervolters, so they’re power hungry. The Gigabyte is a good decision, though the MSI would certainly tempt me.
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wow this is great thanks for supporting FTC
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OMG :o ordering 16 7950s, wow wow…
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[quote name=“justabitoftime” post=“8535” timestamp=“1370097529”]
Ordered 2 Gigabyte (1 for myself and a friend) to get familiar with the mining process. Within 2 weeks, I’m ordering 16 7950s… this should be fun.
[/quote]Hope you’ve got a cold shed and/or air con, an understanding wife and a business so that you can run on commercial rates! :p
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[quote name=“Nutnut” post=“9052” timestamp=“1370266733”]
[quote author=justabitoftime link=topic=936.msg8535#msg8535 date=1370097529]
Ordered 2 Gigabyte (1 for myself and a friend) to get familiar with the mining process. Within 2 weeks, I’m ordering 16 7950s… this should be fun.
[/quote]Hope you’ve got a cold shed and/or air con, an understanding wife and a business so that you can run on commercial rates! :p
[/quote]This is correct. With ~20x7950s running, you’ll need about 15,000 BTU of AC running to support it. Also, you’ll need about 3 new 20a breakers run to support the electrical requirements for that many rigs.
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Spreading them out among locations, can’t wait. :)
