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MaestroManDan
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June 02, 2011, 06:31:05 PM
 #1

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Bitcoineruk
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June 02, 2011, 06:37:30 PM
 #2

I want to run two 5870s for bitcoin mining (since 5970s are literally impossible to find). 

The question I have is this: do I need to crossfire in order to take full advantage of them?  I know for sure that my board (an M4A87TD EVO from Asus with Athlon II X4 CPU) will bottleneck because it only has one PCIe 2.0x16, the other is 2.0x4.  If I have to I'll shell out for a new board, but I'd like to keep costs down until I start pulling in some cash with this machine.

Best to xfire or youll have to use dummy plugs, doesnt use much bandwidth though so x4 slot is fine (people are using the x1 slots fine too Smiley )

Donate if I helped you : 15sE1b7Y6rLMBwwyBLGwSBTQzvB8csUfrX

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acamus
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June 02, 2011, 06:43:41 PM
 #3

I want to run two 5870s for bitcoin mining (since 5970s are literally impossible to find). 

The question I have is this: do I need to crossfire in order to take full advantage of them?  I know for sure that my board (an M4A87TD EVO from Asus with Athlon II X4 CPU) will bottleneck because it only has one PCIe 2.0x16, the other is 2.0x4.  If I have to I'll shell out for a new board, but I'd like to keep costs down until I start pulling in some cash with this machine.

Best to xfire or youll have to use dummy plugs, doesnt use much bandwidth though so x4 slot is fine (people are using the x1 slots fine too Smiley )

Yea, I just ordered one of these. http://www.9mart.com/products/2-Lots-PCI-Express-Card-Extender-Cable-PCI%252dE-1X-Riser-Adapter.html

We'll see if it works, I've seen pics of others using these with vga dummy plugs. I also picked up some 100 ohm resistors from radio shack to make the plugs.

Short Bitcoin  (http://forum.bitcoin.org/index.php?topic=12536.0) if you dare.
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http://oneminuteslow.com/bitcoin/100-20.png (http://forum.bitcoin.org/index.php?topic=8895.0)
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innervisi0nn
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June 02, 2011, 09:45:25 PM
 #4

I'm looking at the wiki for MHash/s, and is the 878 MHash/s on a Windows machine, or Linux?  I'd like to keep this machine windows but I'll boot it Linux if I need to.

The 9th column will tell you what miner/os it was tested on.


870M    116.5    ?    ?    ?    ?    2.1    PCI-E 2.1 x16    gui-miner (win-7)   
5870    313.65    1.668    188    850    1600    2.1    PCI-E 2.1 x16    clmine   
5870    313    1.665    188    900?    1600    2.3    PCI-E 2.1 x16    Diablo/Linux   
5870    343    1.824    188    900?    1600    2.1    PCI-E 2.1 x16    Diablo/Linux   
5870    355    1.888    188    900?    1600    2.1    PCI-E 2.1 x16    poclbm/Linux   
5870    340    1.809    188    850    1600       PCI-E 2.1 x16    m0mchil's OpenCL   source
5870    360    1.6822    214    970    700       PCI-E 2.0 x16    m0mchil's OpenCL w7-64    -f 0 -v -w 128 source
5870    377    2.008    188    850    1600       PCI-E 2.0 x16    hashkill-0.2.5 alpha    -D -G2
5870    408    1.8888    216    980    1600    2.1    PCI-E 2.0 x16    poclbm/Win7x64    -f 20 -v -w 128, BIT_ALIGN, BFI_INT
5870    400    1.9047    210    950    1600    2.4    PCI-E 2.0 x8    Phoenix 1.3    -k poclbm VECTORS AGGRESSION=7 FASTLOOP BFI_INT
5870    398    1.980    201    900    1600       PCI-E 2.0 x16    hashkill-0.2.5 alpha    -D -G2 (GPU OC to 900, memory downclocked to 900)
5870    420    2.0000    210    950    1600    2.4    PCI-E 2.0 x16    Phoenix 1.48    -k phatk VECTORS BFI_INT AGGRESSION=14 WORKSIZE=256 -- Memory Clock 300Mhz
5870    421    1.9581    215    975    1600    2.4    PCI-E 2.0 x16    Phoenix 1.47    VECTORS BFI_INT AGGRESSION=13 -k phatk
5870    440    2.0000    220    995    1600    2.4    PCI-E 2.0 x16    Phoenix   
5870    438    1.9819    221    1000 (OC)    1600    2.1    PCI-E 2.0 x16    poclbm/Linux

Bitcoineruk
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June 02, 2011, 09:46:31 PM
 #5

5870

438

1.9819

221

1000 (OC)

1600

2.1

PCI-E 2.0 x16

poclbm/Linux

-v -w 64 -f 1

and thats if you can get them at 1000 core stable too - not guaranteed Smiley

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innervisi0nn
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June 02, 2011, 09:47:17 PM
 #6

I want to run two 5870s for bitcoin mining (since 5970s are literally impossible to find). 

The question I have is this: do I need to crossfire in order to take full advantage of them?  I know for sure that my board (an M4A87TD EVO from Asus with Athlon II X4 CPU) will bottleneck because it only has one PCIe 2.0x16, the other is 2.0x4.  If I have to I'll shell out for a new board, but I'd like to keep costs down until I start pulling in some cash with this machine.

Best to xfire or youll have to use dummy plugs, doesnt use much bandwidth though so x4 slot is fine (people are using the x1 slots fine too Smiley )

Crossfire really doesn't make a difference, its different for every card/situation/setup. Usually your better out without it (requires a dummy plug if on Windows) (no dummy plug on Linux).

I prefer without.

fx2pm
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June 07, 2011, 03:45:29 AM
 #7

I want to run two 5870s for bitcoin mining (since 5970s are literally impossible to find). 

The question I have is this: do I need to crossfire in order to take full advantage of them?  I know for sure that my board (an M4A87TD EVO from Asus with Athlon II X4 CPU) will bottleneck because it only has one PCIe 2.0x16, the other is 2.0x4.  If I have to I'll shell out for a new board, but I'd like to keep costs down until I start pulling in some cash with this machine.

Best to xfire or youll have to use dummy plugs, doesnt use much bandwidth though so x4 slot is fine (people are using the x1 slots fine too Smiley )

Yea, I just ordered one of these. http://www.9mart.com/products/2-Lots-PCI-Express-Card-Extender-Cable-PCI%252dE-1X-Riser-Adapter.html

We'll see if it works, I've seen pics of others using these with vga dummy plugs. I also picked up some 100 ohm resistors from radio shack to make the plugs.

waiting for your test of these new items. if work good, considering buying too.
LegitBit
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June 07, 2011, 03:48:18 AM
 #8

I want to run two 5870s for bitcoin mining (since 5970s are literally impossible to find). 

The question I have is this: do I need to crossfire in order to take full advantage of them?  I know for sure that my board (an M4A87TD EVO from Asus with Athlon II X4 CPU) will bottleneck because it only has one PCIe 2.0x16, the other is 2.0x4.  If I have to I'll shell out for a new board, but I'd like to keep costs down until I start pulling in some cash with this machine.

Best to xfire or youll have to use dummy plugs, doesnt use much bandwidth though so x4 slot is fine (people are using the x1 slots fine too Smiley )

Crossfire really doesn't make a difference, its different for every card/situation/setup. Usually your better out without it (requires a dummy plug if on Windows) (no dummy plug on Linux).

I prefer without.

+1

Donate : 1EiAKUmTVtqXsaGLKQQVvLT9DDnHsT7jTZ (Block Explorer)
Killarshark33
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June 07, 2011, 04:13:03 AM
 #9

I want to run two 5870s for bitcoin mining (since 5970s are literally impossible to find). 

The question I have is this: do I need to crossfire in order to take full advantage of them?  I know for sure that my board (an M4A87TD EVO from Asus with Athlon II X4 CPU) will bottleneck because it only has one PCIe 2.0x16, the other is 2.0x4.  If I have to I'll shell out for a new board, but I'd like to keep costs down until I start pulling in some cash with this machine.
Well two of them could max about 800 mhash/s so do not think you will be getting 1 block every few days.  It will take you about 20 days I think at this rate to get a block.  Just something to think about before you think your gonna just make cash with this thing.
MrOrange32
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June 07, 2011, 05:12:21 AM
 #10

I've only been running my dual 5870s for a day but I am getting about 725 Mh/s total.  Im running stock clocks 850/1200.
Freakin
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June 08, 2011, 09:20:59 PM
 #11

How many BTC do you manage a day?  I'm on Slush's right now and I was thinking that this setup would average around 1-2/day.

725MH/s = 1.29BTC/day - fees
amtonio
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June 09, 2011, 02:49:18 AM
 #12

I want to run two 5870s for bitcoin mining (since 5970s are literally impossible to find). 

The question I have is this: do I need to crossfire in order to take full advantage of them?  I know for sure that my board (an M4A87TD EVO from Asus with Athlon II X4 CPU) will bottleneck because it only has one PCIe 2.0x16, the other is 2.0x4.  If I have to I'll shell out for a new board, but I'd like to keep costs down until I start pulling in some cash with this machine.

Best to xfire or youll have to use dummy plugs, doesnt use much bandwidth though so x4 slot is fine (people are using the x1 slots fine too Smiley )

Crossfire really doesn't make a difference, its different for every card/situation/setup. Usually your better out without it (requires a dummy plug if on Windows) (no dummy plug on Linux).

I prefer without.

+1
+1
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