Is AGP 8X downward compatible ?

I "ebayed" the following card:
http://www.hisdigital.com/html/product_ov.php?id=125&view=yes

Now I am unsure if the AGP 8x card will interface with the AGP 4x mainboard, of course at AGP 4x speed. Or do I have to get me a new mainboard ?

If you need further information, please ask me.

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criAsked:
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PUNKYCommented:
Based on manual:

http://download.hightech.com.hk/manual/Current/English/X800agp.pdf

The card should work fine on 4x.
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aloyd18Commented:
Yes, this will work.  It will use the motherboard speed.  Look at moving to PCI-Express next time you upgrade.
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CallandorCommented:
The only time you have to worry about AGP compatibility is if the voltages are different: http://www.ertyu.org/steven_nikkel/agpcompatibility.html  Fortunately, AGP8x is compatible with AGP4x slots, though the slot may not support 8x speed.
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SgtSpikeCommented:
I had an eMachine's computer way back when, and it had a 4x AGP slot.  I tried an 8x AGP card in it, and it didn't work, even though the manual said it would.  I tried the card in another computer and it worked perfect.  So, manuals can't always be trusted.  :)

With that said, you should still give it a try on the motherboard you have now.  No sense in buying another motherboard when it will quite possibly work on the one you already have.
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criAuthor Commented:
Duh... me asking a question which can be answerered with RTFM.... But as SgtSpike pointed out, it could still fail. I will install the card this weekend and see whether the manual is correct. I will keep you  posted. In the meantime: Thank for your comments!
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PCBONEZCommented:
AGP 8x is not universally compatible with AGP 4x.
Most (but not all) AGP 8x cards are actually AGP 8x/4x but many only say 8x (their best spec) in the ads and that's where the confusion comes from.

The voltage is the signaling voltage and not the power supply (to the card) voltage. [Another confusion.]

AGP 1.0 SPEC is a 3.3V signaling slot capable of 2x and 1x speeds.
AGP 2.0 SPEC is a 1.5V signaling slot capable of 4x, 2x and 1x speeds.
AGP 3.0 SPEC is keyed like a 1.5V Spec 2.0 slot, but it only uses 0.8V signaling. It supports 8X, 4X, 2X and 1X speeds.

There are AGP 4x slots that only support 1.5v signaling.
There are AGP 8x cards that only support 0.8v signaling.
AGP 8x/4x cards (and slots) support both 1.5v and 0.8v signaling.

SPEEDS are backwards compatible but signaling voltages aren't always.

8x cards will fit in 1.5v(only) 4x slots but if the card doesn't support 1.5v signaling it will NOT run and it may damage either the video card, the motherboard, or both.
[Some (not all) motherboards have a protective feature that won't allow them even boot with the wrong kind of AGP card installed. In the ones that don't have this the board's chipset can be damaged.]

.
Make SURE it is a AGP 8x/4x card vs an 8x only and you should be okay.

.
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criAuthor Commented:
Sorry to keep this question open. Because of the last comment I did not want to hurry the installation. I really do not want to damage this mainboard (yet). Getting one with a 478 socket, besides badly outdated, even in e-bay or similar, is astonishingly difficult and expensive. Getting a state-of-the-art mainboard i.e. with a LGA775 socket would result in having to buy a new (of course much faster) CPU, matching (faster) RAM, a PCI-E graphic card (would solve this question....) , probably a new Power Supply due the new connector. Last but not least: Hours of tedious work doing a complete reinstal of Windows. I strongly doubt the existing setup would fit the new hardware. And even if it would: WGA would reject it.  With other words: a new PC (and Vista ? No go...)

I will be away for 1 week but I will not forget this question.  
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PCBONEZCommented:
Your question was will an AGP 8x card will interface with the AGP 4x mainboard.

That's been answered.
I'm not even sure what that last post is about, it's not directly related.
If you have other questions then you need to open new questions.

.
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criAuthor Commented:
PCBONEZ, if you read my last comment instead of making undue pressure to close the question you will see that it _is_ related. Or do consider damaging the motherboard as interfacing ? And I am not making a question chain, only explaining the delay to settle it. And, I will not abandon this question.
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PCBONEZCommented:
Your question was will an AGP 8x card will interface with the AGP 4x mainboard.

That's been answered.

Speculation about options of using other motherboards is not relivant.
That's a competely different question.

I'm in no hurry for the question to be closed.
It irritates me that you are trying to abuse this service by rolling all of you questions into one thread and then only 'paying' for one instance of service.
- That's not how it works.
.
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SgtSpikeCommented:
cri,
It's a quandry many of us have faced in the recent year, as a newer motherboard requires newer everything else.  In my opinion, it's best to just jump in and make the change.  Old hardware is expensive, and you end up witih much less for the money.  And yes, a Windows reinstall is a pain, but in the end, after it's all said and done, you'll be much happier with a speedier 775 system.  A very good midrange system can be put together for ~$500 these days, so do consider it.  :)
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criAuthor Commented:
PCBONEZ you do not get it, right ? I am not 'speculating' about other motherboards, I am hesitating to install a graphic card which could ruin an aging but working PC. But do not worry about the points, I am nerdy enough to valour the technical content your contribution.

SgtSpike, you know the Mastercard TV spot? Mainboard 150$, CPU 200$, RAM, 75$, graphic card 150$ etc....Discussions with my "better half" why the younger kid gets a new PC: priceless

Callandor, thank you for your insight and patience.
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PUNKYCommented:
If you are worry about damaging the motherboard or the card, then dont do it. Stay with the current PC unless it has problem to prevent you using it.

Speaking of buy components and build the PC in these days? If you have time and really want to do that, no problem ... but the whole system that you can buy in the links below for example:
Desktop:
http://shop3.outpost.com/product/5475039 
Laptop:
http://www.frys.com/product/5517100

You can even get cheaper in onsale days.
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criAuthor Commented:
It is high time to settle this question. Although I still can not make up my mind whether to risk installing the graphic card, the question _was_ answered. I am increasing the points from 250 to 400 do account for the delay. Awarding the question according technical content respectively which is best as PAQ.

Thank you all for your contributions.
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