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3870 x2 problem?


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#16 cryptodan

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Posted 16 August 2011 - 03:25 PM

No it doesn't it means that each GPU has 512Megs of RAM each equating to 1Gig for the entire setup hence 512Megs x 2 = 1024Megs.

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#17 mikeb2817

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Posted 16 August 2011 - 03:31 PM

Right ok, so your saying that the 3870 x2 512mb card is 2x512 mb

where as the 3870 x2 1gb is also 2x512mb?



Have we got our wires crossed here, or am i explaining things wrong.

http://www.hwcompare.com/4770/radeon-hd-3870-x2-1gb-vs-radeon-hd-3870-x2-512mb/

Thats both the cards side by side, i have the 3870 x2 1gb, at the bottom where the specs are it says that it is 1gb (x2) but what you are syaing is confusing me somewhat.
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#18 cryptodan

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Posted 16 August 2011 - 03:36 PM

The 3870x2 1Gig is not 1x2 got memory it is 512Megsx2 and the 512Meg version of that card is 2 x 256.

#19 mikeb2817

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Posted 16 August 2011 - 03:39 PM

Ahh right ok, do you have a source for this as that hw monitor seems to have its specs wrong :P
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#20 cryptodan

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Posted 16 August 2011 - 03:44 PM

If it had 2 1Gig Sticks of RAM that card would still be a beat, but it doesn't its all the math.

2 GPU's sharing the same PCB can only share the same RAM so therefore a 1Gif 3870x2 would have 2 x 512 Meg Chips on board as at the time the card came out they were only up to 768Megs so 2Gig would have pushed that card well over 700 bucks.

Here: http://www.anandtech.com/show/2428

Edited by cryptodan, 16 August 2011 - 03:46 PM.


#21 mikeb2817

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Posted 16 August 2011 - 03:56 PM

Ahh ok that makes sense.

Ok so back to my original question, i have updated my bios to the latest but hav eyet to try my gpu.

To power it would i be ok using the 2x4 molex adapter in to molex connectors that have other things on them, ie, fans, cddrives etc or should the leads be completly free?
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#22 cryptodan

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Posted 16 August 2011 - 05:11 PM

To be powering it you need to be using the PCI Express Power plugs.

As seen here:
Posted Image

See the right?

#23 killerx525

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Posted 16 August 2011 - 05:16 PM

Your power supply has 2 6+2 pin PCI-E connectors.

>Michael 
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#24 mikeb2817

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Posted 16 August 2011 - 05:40 PM

I bought the computer used and as its modular the previous owner didnt bother with one of them, iv ordered one off the internet, updated my bios and will try the card again when it gets here.

Is there any chance it just isnt compatible with my motherboard even though other people have had it working, or am i just missing something?

I dont think its broken as like i said the same hting happened with a 100% functioning gtx 260.
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#25 cryptodan

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Posted 16 August 2011 - 07:23 PM

Your motherboard is fully compatible with your video card.

#26 killerx525

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Posted 16 August 2011 - 07:53 PM

The majority of pci-e card will work with pci-e slot with most motherboards that has the slot.

>Michael 
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#27 the_patriot11

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Posted 16 August 2011 - 10:05 PM

for the 3870 x2 to work you need both the 6 pin and the 8 pin connector, as well as a really solid 600+ watt PSU to run solidly. It is a very power hungry card (I know I used to have one)

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#28 killerx525

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Posted 16 August 2011 - 10:20 PM

The Corsair power supply runs solidly.

>Michael 
System1: CPU- Intel Core i7-5820K @ 4.4GHz, CPU Cooler- Noctua NH-D14, RAM- G.Skill Ripjaws 16GB Kit(4Gx4) DDR3 2133MHz, SSD/HDD- Samsung 850 EVO 250GB/Western Digital Caviar Black 1TB/Seagate Barracuada 3TB, GPU- 2x EVGA GTX980 Superclocked @1360/MHz1900MHz, Motherboard- Asus X99 Deluxe, Case- Custom Mac G5, PSU- EVGA P2-1000W, Soundcard- Realtek High Definition Audio, OS- Windows 10 Pro 64-Bit
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#29 mikeb2817

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Posted 17 August 2011 - 08:11 AM

@ the patriot, it actually states on the box that it runs of 2x6 pin connectors, and that the 8 pin connector is really for the overdrive feature or something along them lines.
My Ghetto System
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#30 the_patriot11

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Posted 17 August 2011 - 08:28 AM

My apologies- I misunderstood I thought you only had one six pin hooked up. Though I still wonder if trying a 8 pin might solve it

picard5.jpg

 

Primary system: Motherboard: ASUS M4A89GTD PRO/USB3, Processor: AMD Phenom II x4 945, Memory: 16 gigs of Patriot G2 DDR3 1600, Video: AMD Sapphire Nitro R9 380, Storage: 1 WD 500 gig HD, 1 Hitachi 500 gig HD, and Power supply: Coolermaster 750 watt, OS: Windows 10 64 bit. 

Media Center: Motherboard: Gigabyte mp61p-S3, Processor: AMD Athlon 64 x2 6000+, Memory: 6 gigs Patriot DDR2 800, Video: Gigabyte GeForce GT730, Storage: 500 gig Hitachi, PSU: Seasonic M1211 620W full modular, OS: Windows 10.

If I don't reply within 24 hours of your reply, feel free to send me a pm.





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