Pretty much spot-on. At worksize=128, between 180 and 250 the hashrate varies by a couple Mh/s, below 180 it drops fast and above 250 it starts decreasing slowly. By mem clock 300, worksize=256 is ~10 Mh/s faster and peaks at mem clock 354. But the worksize=256 peak @ mem clock 354 is still about 5 Mh/s lower than the worksize=128 peak at mem clock 186.
I wonder why the hashrate is spiking at those values? It seems extremely odd to me that there should be performance spikes at such low clocks. I'd expect them to be at the high end. If this is not a dedicated rig though, then there is one issue with using mem clocks as low as ~200. Any load on the video card, such as playing video or flash, will lower the hashrate a lot more than at higher mem clocks.
Yeah, I noticed that. I got around the flash problem by disabling hardware acceleration for flash. I also noticed that avi files had no effect on the hash rate but mkv's dropped it to about 50 Mh/s. I'm only downloading xvids from now on, they seem to play ok with AGRESSION set to 6 and I'm trying to avoid or disable anything that uses hardware acceleration. |
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+1 to this guy. Sadly AMD has not released any 7xxx info basically. Well except the 7xxx mobility, showing proposed die-shrink, but that doesn't tell you much about the full scale versions. if they are tweaked 5/6xxx that will likely not be a good sign looking at the 6xxx vs 5xxx in terms of $/MHash (though good in $/Watt).
I don't know where you guys are getting this info from that the 5000 series give better hash rates as they don't. The equivalent 6000 series cards gives a couple of more Mh/s. As for the 7000s, if it's just a die shrink, we'll see a major increase in hash rates if the GPU stays the same size, as there would be over a billion more transistors. A 28nm 6870 with a GPU size of a 40nm 6870 would offer similar performance to a 6970. On the other hand, the size of the GPU could be reduced, keeping the same number of transistors as before. This would provide a decrease in power consumption. With smaller transistors, you can pack in more SPs per mm^2, and lots of SPs is what makes these cards good for mining. If the 7000 series is simply a die shrink, then we'll see faster hash rates, decreased power consumption, or both. Just look at the difference between the 55nm 4000 series and the 40nm 5000/6000 series. |
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So why couldn't you just use a 6 pin PSU to 6 pin PCIE cable directly,... I don't know why you are not getting it. Here's a picture. I don't KNOW if "they" make a 5pin-molex to 6/8pin-PCIe power cable. But if not, then one must use an adapter in conjunction with a 5pin-psu(molex) cable. I've never seen those 5 pin peripheral sockets before. All the modular PSUs I've seen use 6 pin peripheral connectors that look just like 6 pin PCIE plugs. |
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Will one of you guys who are running at 300 mem clock and worksize=256 give 225 mem clock and worksize=128 a try, and let me know your before and after results.
I don't have any 5830s, but all 58xx cards should behave similarly. On my 5870s I noticed that below ~250 mem clock worksize=128 works better. In fact, the optimal settings I've found we're at mem=186, worksize=128. That gives a few Mhash/s more than worksize=256 and mem anywhere between 250 and 400. The conclusion I came to with the 6870 was that the sweetspot was between 180 and 240. I was thinking the 5800s should be similar. There seemed to be a nice spike between those values, then below 180 the hash rates fell off rapidly. Did you find a similar pattern? |
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Well, I guess the only difference is that you would need a 4pin-Molex-to-6/8pin-PCIe modular cable. Not sure if they make those.
I think they make molex-to-6/8pin adapters. You could use an adapter with a molex-to-molex cable.
This would be a perfect solution.
So why couldn't you just use a 6 pin PSU to 6 pin PCIE cable directly, instead of a using a 6 pin PSU to 4pin molex cable combined with a 2 molex to PCIE adaptor? That's what I don't get and it seems extremely odd to me. If you can use the molex adaptors, then you should just be able to replace the whole molex cable with a PCIE cable. |
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Will one of you guys who are running at 300 mem clock and worksize=256 give 225 mem clock and worksize=128 a try, and let me know your before and after results.
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If you've got a modular PSU and not enough PCIE cables, couldn't you just buy more cables?
No, not really. When you buy a modular PSU, it comes with ALL cables it can handle. So, the X4 1200w, for example, supports 6 6/2-pin cables, and includes 6 6/2-pin cables. (That's 3 video cards) If you need 2 more, you will need a converter to/from a molex, apparently. So, whats the difference between adding an extra molar cable and adding an extra 6-pin PCIE cable? |
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I use GUIminer running Phoenix with the following settings: -k phatk platform=0 device=0 VECTORS BFI_INT AGGRESSION=13 worksize=128 FASTLOOP=false The usual advice would be to set your mem clock to 300 MHz and use "worksize=256". My settings give me an extra 7 Mh/s, so give them a try. I've read that WORKSIZE=128 (-w128) is best for 5xxx and up, excluding the 5830s! But, I have seen mixed results, so YMMV! The 5830 and 6780 are pretty much the same card so there shouldn't be any difference in the way they behave really. For the 6870, "worksize=256" is only supposed to be better with a mem clock of 300 MHz, so it should be the same for the 5830 as well. I found it to be prettty much true. Dropping the memory down to 225 and switching to "workload=128" gave even better results though. I based my settings on this:  I managed to tweak it a little more though. If you've got a 5830 od 6870 I'd deffinitely give those settings a try. They worked as a very nice starting point for me. |
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There seems to be a lot of these type of blocks lately. MtRed just had one with 4,124,050 shares followed by one with 1,422,614 shares. Ouch.
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I got the XFX 6870 from CompUSA. Its fan is at the back. I installed msi afterburner, and the only things it allows me to edit are the Core Clock, Memory Clock, and fan speed. Whether they will be stable edits, I am not sure yet.
Dave
Some XFX cards (other brands too) use VRMs that are not supported by MSI AB! The newest version of AB WILL allow voltage adjustment on reference PCB 6xxx cards. Though, it doesn't necessarily have to be reference! Just to clarify, you did do the EULA, and the check box in the settings for voltage adjustment? I had not, but now have. I can edit the voltage if I so desire, and the ceiling has been raised for my core (from 1000 to 1350). But it's not stable after 950 mhz anyways. (956 being the highest). I guess what I was trying to say is that XFX cards aren't stable to overclock above stock. (less than 10% OC) I only wish my memory could go lower than 525 mhz. EDIT: I reverted the tick-boxes, and restarted MSIAB, and now my memory can go down to 260 mhz. How weird. Cool, but weird. I have an XFX 6870 as well. To underclock the memory lower, just close down AB and re-open it. Now you can go down to 260. Repeat as necessary. I'm using 225 mem clock, 1020 core clock, and 1225 mV and getting around 315 Mh/s. I pushed up the core clock to 1050 and was getting around 330 Mh/s but the fan was too loud. It was stable though, with a temperature of around 75 C. I use GUIminer running Phoenix with the following settings: -k phatk platform=0 device=0 VECTORS BFI_INT AGGRESSION=13 worksize=128 FASTLOOP=false The usual advice would be to set your mem clock to 300 MHz and use "worksize=256". My settings give me an extra 7 Mh/s, so give them a try. |
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If you've got a modular PSU and not enough PCIE cables, couldn't you just buy more cables?
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Hi, I'm just wondering if you'd be willing to sell individual components? I've got a couple of upgrades lined up over the next few months and it would be ideal if I could just purchase those parts directly with bitcoin.
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Based on the performace of a single 6870, we should see about 600 MH/s from it. |
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Depends on how you value your time. You can have the card for $160 right now so you can mine immediately... or you can spend your days refreshing the Newegg page hoping for a $110 5830 which may never come. Stop telling people what they should prefer. You're like that annoying guy who tells everyone what a great deal they could have got if they just would have asked him about it before the purchase.
"How much did that shirt run you?"
"$40."
"Oh man.... you got ripped off... I know this guy who sells them out of the back of his van for $30!"
Piss off. If spending a little extra money means I don't have to hear about your pseudo-existent deals and how my preferences amount to an objective rip off, it was money well spent.
You can get a 6870 right now from Newegg, in fact, you get 5. When you can get a 6870 for $165, $160 for a 5830 is a bad deal for the buyer and the seller is simply taking advantage of their ignorance. |
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Unless you are able to sell 5830 to me $109 shipped immediately, then I think you should stfu. Availability has its value. Sapphire 5830 at $160 is still cheaper than the cheapest Sapphire 6870 (rebate can only be used once per address, even with rebate it is $190). If you are building multiple machines with 4 x GPU, the price difference add up to a lot of money very quick.
Sure $109 price point is great, IF you can get them. Otherwise you'd have to wait god knows how long, and be god knows how fast to get any at $109.
If you go to Newegg you will see that they do have a 6870 for $165 with rebate and it is limited to 5 per customer, available right now. |
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Look at the specs for the cards, ATI HD 5830 and AMD HD 6870. Both cards have 1120 Stream Processors and 56 Texture Units. The only difference between the two cards, is that the HD 6870 has twice as many Z/Stencil ROP Units (128 compared to 64) and twice as many Color ROP Units (32 compared to 16). The 6870 also runs at higher clocks, 100 MHz higher for the core and 50MHz higher for the memory. It can also be overclocked further. The 6870 is clearly the the 5830 with a couple of tweaks and offers slightly better performance all around. If you can get both cards for a similar price, then you're better off getting the 6870. It's the better card. |
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Do not by a Ford Festiva for $20000. It's a rip-off.
Make sure when you buy a Festiva is a good price in relation to that 88 Monte Carlo.
Given that a quick search on Google says that you can get a Festiva for around $1,700-1,800, I agree, that is a ripoff. If you think paying $160 for a used previous generation video card, when you can a get a brand new, better performing, current generation video card for the same price is a good idea, then as the saying goes, I've got a bridge to sell you. |
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The 6870 will offer better performance for both mining (only a Mh/s or two) and gaming and is widely available at $180 brand new. Some are even going for $160 at the moment.
If you're buying a 5830, then make sure it's at a reasonable price compared to a 6870.
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The 5830s do not outperform the 6870. They both have 1120 Stream Processors and 56 Texture Units. The 6870 has twice as many Z/Stencil ROP Units and Color ROP Units. Mining wise they're pretty much identical, with the 6870 giving slightly better results, likely due to it's higher clocks.
The 6870 is basically the new and improved 5830, so if they're around the same price, you'd be mad not to choose the 6870. A 5830 is not worth $160. Personally, I'd rather pay $180 for a 6870 than $160 for a 5830 but I game on my rig as well as mine.
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