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3x1080p monitors - Do I need more than 2GB vram? - Page 2

post #11 of 16
Quote:
Originally Posted by smaudioz View Post

It's not limited by the memory bus, 256bit is fine for 2GB or 4GB configurations. From what I have read about this it's the bandwidth that matters and not how many bits the bus is, and a 770 has enough bandwidth (224.3GB/sec) to deal with more than 2GB of VRAM.

basically

multiples of 2 (e.g. GTX770):
2GB/4GB cards - 256 bit

multiples of 3 (e.g. HD7970 / GTX titan):
3GB/6GB cards - 384 bit

multiples of 4 (e.g. R9 290x)
4GB/8GB cards - 512 bit


then for example more odd ones like my GTX 570 is 320 bit for 1.25GB/2.5GB/5GB (if there was a 5GB version which there isn't, but if there was it would use a 320bit bus)

True, however if two GPUs are 6000MHz, then the 384-bit bus would be 50% higher than the equivalent 256-bit card. I looked at a review comparing crossfired 7850s and some other AMD GPUs including a 7970GHz (OP, this is the same thing as a 280X, FYI) and, while the 7850s won by a large margin in general at 1080p, they started to lose ground around 1440p and actually lost despite having more raw power at 3x1080p Eyefinity.
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post #12 of 16
Thread Starter 
Quote:
Originally Posted by raghu78 View Post

the older dc2 HD 7970 comes with the 3 slot cooler which keeps very low temps and noise . game bundle . $280 (260 after mir). unlocked voltage. you have to use asus gpu tweak to do voltage overclocking

http://ncix.ca/products/?sku=68755&vpn=HD7970-DC2-3GD5&manufacture=ASUS&promoid=1145

That card has a lot of DP outputs! Is it the same as the 280X Matrix for $360?

Ohh I will consider that Raghu, but ever since my last experience with a new card (return/exchange multiple times in a single day), I've been feeling more inclined to shop at my local dealer.
They will price match to any retailer in Canada, and so long as its in stock and the part #s match, they will beat the competitors price by 25% of the difference.

With that said, what would you recommend from this website www.memoryexpress.com ?
It seems like they're pretty much out of 7970s =/
post #13 of 16
BF4 at 5760x1080 on 3 23" screens running ultra pre-set according to my keyboards LCD screen (G15) each GPU is using about 2.9GB at sometimes during the game, which is near the max of my 7990's VRAM limit for each 7970 aboard. I would not do no less then 3GB for 3 monitor eyefinity/surround.
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post #14 of 16
Bandwidth is a combination of memory speed and bus width.
post #15 of 16
Thread Starter 
This may be a stupid question, but would there be a difference in quality/control settings with 3 monitors if I hooked all 3 up with different inputs (DVI,HDMI, DP), as opposed to hooking all 3 up with displayport?

I'm deeply considering the 7970 DCII with the 4 Display port connectors that Raghu linked. It seems very similar to the Matrix model of the 7970/280X too
post #16 of 16
Quote:
Originally Posted by Dragon-Emperor View Post

This may be a stupid question, but would there be a difference in quality/control settings with 3 monitors if I hooked all 3 up with different inputs (DVI,HDMI, DP), as opposed to hooking all 3 up with displayport?

I'm deeply considering the 7970 DCII with the 4 Display port connectors that Raghu linked. It seems very similar to the Matrix model of the 7970/280X too

It shouldn't. I ran an external monitor with a VGA connection off my laptop in addition to the built-in who-knows-what (probably digital, the driver indicates "Generic PnP Monitor") and had no problems in games or any artifacts in general use. Yes, it's a laptop with an integrated 4250, but I don't get artifacts or any glitches with it, dual-monitor or not. If I had a DVI-I to VGA adapter, then I could test different configurations when I get home on a 7850, but I do not, sorry. I can tell you that I've had issues using the HDMI input on both my ASUS monitor and a TV but DVI has been flawless and I've had no issues with VGA.
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