Ok guys , mainly I agree that there is backward compatibility between 2.0 and 1.0 but I cannot be sure if the compatibility is the same between PCIe 2.0 and PCIe 1.0a or what difference is between 1.0 and 1.0a. I've read that 1.0a is a bit more restrictive than 1.0 but I don't know what that means. I also know that HD 3xxxx series are working for sure with 1.0 and 1.0a because there are automatically programed to adjust the speed to the PCIe slot. And there are info . on the internet specifically for the match between 1.0a and HD 3xxxx series. There is not the case for the match between 1.0a and HD4xxx series. I couldn't find nothing on the internet for that specific situation. Did you ?
I'm about to buy the HD 4870 so I will dislike to have to sell it back if it won't match the 1.0a slot.
You ask a question and you get two very intelligent people answering your question and then you add in "Well I think that I have to admit that IT WORKS ."
You think they are right?? Really? Those two have forgotten more than you know.
Then after they answer, you search around and see that someone did what you are asking - which is what you should have done in the first place.
If you arent going to trust the experts - why write in?
My question to you would be why keep such a crappy system and put a very good graphics card in it?
"The doubt is the mother of wisdom" I'm not sure if this is the proverb in English but is an acceptable translation.......... i guess.
How will I know that those two are "very intelligent people" ??? Maybe they are, maybe they........ don't know for sure (as I do, I mean I don't know for sure ).
There are a lot of enthusiastic and altruistic 14 y.o. boys around the forum, ready to give you the best answer. So are you sure is the ultimate truth? you can't be, and if you go on their hand, from first ,... well that's called superficiality.
So I have the right to doubt. I need proof. A written one. And the official texts are quite divided.
"As PCI express 1.0/1.0a standard is not compatible with PCI express 2.0 specification, installing PCI express 2.0 cards onto PCIEX16_2 slot will result in system fail to detect expension cards installed"
I've been searching around a lot , I mean A LOT , and frustration made me to put the question here in between time.
If they state that they are experts ,.. no problem, I'm happy to trust everything they will answer from now on . I didn't know that .... In my mind experts are not available on forums, they work for pentagon or microsoft... I'm happy to hear that Tom's has some well payed experts that chat with everybody on the forum.
well the system if cheap now , and has the PCIe x16 like the Pcie 2.0 which you will never use at full, never , only if you put inside the latest mightiest graphic card, that costs, only the card , 3 times more then my whole system. So there is no point in investing money in hardware. Besides System Bus 2000/1600 MT/s is enough to play games , even SUPCOM aka Supreme Commander , or even the Crysis and so on. The "crappy system" is DDR1 ,.. BUT .. I have 4ns. access time on that DDR, and CL2 which leads to the high enough responsiveness. The CPU is dual core and 64 , and has 2Mb L2 cache ..is decent. Its an Athlon 64 x2 +4800 (ADA4800DAA6CD).
The HD4870 will be probably bottlenecked, but I can put it in the next not so crappy system that will follow this one, if I'm not satisfyed by its performance.
That's the story man,.... nothing more nothing less.
Am I wrong ? If so thanks again for don't letting me in the dark.
Nice we !
P.S. I'm really curious about the reply . And I'm a good guy even if you may think I'm a bit ironic, but , .. u know ,..... why not ? "Pour l'amour de l'art ".
Even myself taking info from the pros i like to ask around, i try and take things from every perspective so dont be too harsh on him whocares, if he wants more opinions, then sure hes more then welcome to ask some other people as well
So ,.. I got the 4870 1G from Sapphire. I stick it on the blue (main) PCIe 1.0a and all I have, are the 3 red led (of death) and the 3 green led on the back of the video-card. No boot screen no nothing. All vents and fans are running. The PSU is a brand new Seasonic S12D (750 W .... max 900W) (more than enough, can it be faulty?? how can I test that?)
All cables are fitted in place the 24 pin motherboard + 4 PIn , the 2x 6PIN PCIe cables on the video card .
The card was tested with the other 2PCIe cables from the 1rail , 2 rail , and mix off the 2 rail, as the cables are marked by "yellow" and "yellow with black stripe" to make difference of which rail they come.