Originally posted by: Cookie Monster
Its because of the low fan speed. There are workarounds in this, if you can find them. Shouldn't to too hard tbh ;.
Originally posted by: Cookie Monster
Currently its at a very primitive form, i.e editing the BIOs something most users that aren't familiar with it should avoid. I suggest you wait til rivatuner or any other "credible" 3rd party tools start supporting these new cards.
Where are the cat 8.7s btw?
Originally posted by: Sylvanas
Originally posted by: Cookie Monster
Currently its at a very primitive form, i.e editing the BIOs something most users that aren't familiar with it should avoid. I suggest you wait til rivatuner or any other "credible" 3rd party tools start supporting these new cards.
Where are the cat 8.7s btw?
There is a method for adjusting fan profiles in the CCC with which you will avoid any BIOS mods, it's here somewhere on the forum. The Cat 8.7's will be due anytime between 1st July and 31st of July
Originally posted by: Elcs
Originally posted by: Sylvanas
Originally posted by: Cookie Monster
Currently its at a very primitive form, i.e editing the BIOs something most users that aren't familiar with it should avoid. I suggest you wait til rivatuner or any other "credible" 3rd party tools start supporting these new cards.
Where are the cat 8.7s btw?
There is a method for adjusting fan profiles in the CCC with which you will avoid any BIOS mods, it's here somewhere on the forum. The Cat 8.7's will be due anytime between 1st July and 31st of July
I cant find the Cats for the 4870 on ATI's site anywhere *confused*
But the fan fix is welcome!! (once i get an OS on)
Originally posted by: Janooo
Originally posted by: Kuzi
Originally posted by: nanaki333
i'm curious to see the power draw compared to just 2 4870 in crossfire. i would have 2x 4870 in my machine, but i want to see how this thing is on heat, power, and if it really will be ~15% faster than just 2 4870s in crossfire. i guess my 9800GX2 will have to wait a little longer to be upgraded....
I do believe the 4870x2 will be the fastest card available when it's released, but I don't think it'll be much faster than two 4870 cards in CF. There are a few reasons for this, but the main reason could be that these 4870x2 cards may have lower core clocks compared to the 4870, example 700Mhz vs 750Mhz. This may have to be done to lower power consumption and heat.
Unless ATI surprises everyone and the R700 will be two 45nm chips
How about 778MHz.
AMD?s team in Austin managed to use two R700 dual-GPU graphic cards (four RV770 chips) to get a score of X12515. This was done with four GPUs, while Nvidia uses three GTX280 boards to achieve a similar score. The R700 boards were clocked at 778 MHz, while the GDDR5 memory was clocked at 980 MHz QDR (that's 3920 "MHz", or just 3.92 GigaTransfers/sec), we were told.
the core clock has not yet set, built-in 16 32 M x 32 GDDR5 memory particles, a total of 512 Bit, 2GB (256Bit, 1GB x 2), priced only $ 499 U.S. dollars, AMD disclosed to the VGA industry, Radeon HD 4870 X2 will be able to easily overwhelm NVIDIA GeForce GTX 280.
Originally posted by: Astrallite
SLi performance is a bit misleading. While the average framerate ends up looking great, the issue is the minimum framerate doesn't tend to go up that much. You get maybe a 20-30fps average fps gain, but the minimum fps goes up from 18 to 21.
Then you have the problem where occasionally SLI will have worse minimum framerates due to latency between cards, but the average still looks much higher. The game will be choppier but the numbers look better.
Now this usually is circumvented in x2 cards but not always.
That's surprising if true. That'd make the 4870 X2 a even better deal @499. Said that, it's not very likely, IMO. Not only the memory cost would be doubled, but also PCB design would be considerably more complex. All that for less than two regular 4870.. Right now the supply situation of HD 4870 isn't the most desirable, and knowing the same core is used on both 4850 and 4870, it's obviously have to do with the memory supply.
Originally posted by: taltamir
mmm... we kept on hearing it WILL be 1GB but shared across both GPUs.... supposedly THAT will eliminate microstutter somehow...
But now it says 2x1GB?
Originally posted by: Aberforth
Is it possible to CF 4870 and 4870X2??
Evaluation samples are schedule to be available in mid-July, and AMD will begin shipping reference design boards with 2GB GDDR5 memory at the end of the month, the sources detailed.
HD 4870 X2 graphics cards are expected to be priced around US$499, the sources detailed.
I've been linking them throughout, but its *very* obvious in any bench that uses 4GHz and some of the exotic configs out there, like Tri-SLI or CrossFireX. Anyways, here's two really good examples from Tweaktown:Originally posted by: toslat
On being CPU limited:
A simple test using two quads at two different clocks (all else same) should put this to rest
On PLX 'bridge' and shared PCIe:
The PLX chips on x870X2 do not split lanes i.e. 16x switched ~= 8x:8x. It is wrong to use 8x:8x performance of 4850 CF to predict performance of 4870X2
IIRC the 3870X2 has a 48 lane 3 port v1.1 PEX8547 switch (not a bridge) and thus each GPU gets full 16x access when it is granted and not 8x. The advantage of this is that since the PCIe connection to the north bridge carries bursty traffic (actual traffic pattern depends on the game), the impact of latency is reduced and bandwidth preserved, as opposed to the bandwidth bottlenecking that would occur with a fixed 8x:8x split.
In the 4870X2, the new switch (possibly PEX8648) will support v2.0 which will double the available data rate (though with slight latency increase).
Also its is rumored that inter GPU traffic will improve. Not sure if inter GPU traffic went through the NB (and memory) in the 3870X2 since the switch functionally could route traffic between the GPUs. So I expect, at the least, that inter GPU traffic is switched at the PEX chip, and if possible they might have a common/duplicate memory area.
So there is no basis yet to state that the 4870X2 will be bottlenecked by the 'bridge' unless you can provide stats that show that the traffic pattern on the bus is sustained at >50% for a 4870 (single or CF),and even then show that ( 2x individual data - common data) exceeds 100% of 16x in CF