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Slightly confused about the hd4870x2

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  • Graphics Cards
  • Motherboards
  • Graphics
Last response: in Graphics & Displays
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August 20, 2008 6:06:51 PM

After reading a little about the hd4870x2, I just need a couple things cleared up.

1. I know x48 motherboards work great with crossfire, but since the 4870x2 is on one card, would there be any performance loss on a p45 motherboard?

2. Any point in getting a 4870x2 if you're only using a 22" LCD? I know it will somewhat increase framerates, but does it justify the $300 difference to a single hd4870, a more expensive x48 motherboard, and a higher PSU?

I'm about to order a Q9550, hd4870, p45 mobo, and 8gb of ram system and not sure if I should switch to a 4870x2. Thanks.

More about : slightly confused hd4870x2

August 20, 2008 6:57:44 PM

With a 22" monitor a single HD 4870 would do you fine. 4870x2 is meant for the best of the best game + monitor pairings, as well as top-end hardware to go with it. Any resolution below 1920x1200 and any game older than CoD4 (just guessing here, I'm not really sure) with all settings maxed out would do the 4870x2 injustice.

As for your question about the P45 vs X48 chipsets, the 4870x2 shouldn't lose any performance unless the slot you put it in runs at x8 instead of x16 (which some P45 boards have). Other than that I don't think you'd notice any difference in performance, so just make sure the P45 board you get has a x16 PCI-E 2.0 slot.

So, basically, HD 4870 is fine, P45 board is fine (just make sure you get a x16 slot with it) and you don't need to spend $500 more for all the extra equipment since your monitor is only 22"
August 21, 2008 12:19:57 AM

Lets say that you buy a 4870 now then the price drops months later. You decide to buy another and crossfire (for arguements sake, you buy a mobo that has crossfire---2 PCIe 2.0 x16 lots). Is this just as bad as getting a 4870x2?
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August 21, 2008 1:03:06 AM

mikeny said:
Lets say that you buy a 4870 now then the price drops months later. You decide to buy another and crossfire (for arguements sake, you buy a mobo that has crossfire---2 PCIe 2.0 x16 lots). Is this just as bad as getting a 4870x2?


Most benchmarks I have seen show the 4870x2 and 4870 crossfire trading blows in different tests. The 4870x2 is supposed to be faster because of more ram available to each core (1gb vs 512mb) and the interconnect between the two GPUS is supposed to be better than the crossfire bridge for two physical cards. It may just be driver optimization or games not supporting the dual gpu solution, but it goes back and forth between the two options.
August 21, 2008 2:59:56 AM

So if you don't play FPS but play MMORPG's and FSX, is one 4870 good enough? For the 4870 to be optimized I guess I would have to trade my 19" monitor for a 20-21" monitor?
August 21, 2008 3:07:14 AM

Yeah the 4870 is definitely plenty. I bought the 4870 X2 because I had the money and having the absolute best kind of feels good for a change, was it a smart decision? No, I wouldn't be an enthusiast if it was.
August 21, 2008 3:47:47 PM

I must say that the 4870x2 is tempting to buy :) 
August 21, 2008 3:58:56 PM

The_Blood_Raven said:
Yeah the 4870 is definitely plenty. I bought the 4870 X2 because I had the money and having the absolute best kind of feels good for a change, was it a smart decision? No, I wouldn't be an enthusiast if it was.



It actually was a pretty smart decision, because that card is going to have a ton of longetivity.

I really don't believe in buying a bargain GPU every year - I think its a lot smarter to buy one really good gpu every couple years and have it last until either A: you want to double it up for more performance, or B: move onto the next generation.
August 21, 2008 5:11:24 PM

I agree w ovaltineplease.

I'm looking at a mobo w amd790GX - and a HD-4850 card.
2x PCIe2 slots - you gotta check specs on these, they are all different in the actual electrix!
- this one is (x16, x8) (i think!) - (for using a single slot)
- with dualcards= crossfirex they both run as (x8,x8) (using both slots)

- high end boards will actually run at (x16,x16) - so check specs!

They say there is not much difference in perf between x16 and x8 - whatever that means - there is a slight difference
- and it would probably affect a 4870x2
but maybe not a 4870
and probably not a 4850. So I believe I could easily add a 2nd 4850 later.
August 21, 2008 7:53:49 PM

The 4870 X2 has alot of ups. Such as SLI (welll Crossfire that is) with out a CrossX board needed. Alot of ram for the mega screens.

So really the 4870 X2 is very important for Enthousiasts or users with little space in the case.

To date it is the strongest single slot card out on the market.

HD4870 X2> 9800 GX2 > 280 GTX > HD4870/260 GTX > HD4850/9800 GTX+ > 8800 Ultra/GTX >8800 GTS 512/ 9800 GTX etc....

Just some that come to mind quick
August 22, 2008 3:03:35 AM

This is my headache lol. Do you take a noticable hit in frames and GPU power if you don't go with the 4870x2 to 4870? Im torn between the 4870x2, 9800gx2, 280, and 4870.
!