Question 1

what power supply do you need in Watts?

Accepted Answer

The car alone can draw up to 300watts, personally I have never built a rig with a power supply 800 watts just in case I wanted to expand in the future.  For two of these cards I would not run less than 1000 watts

Question 2

I currently have the Asus ROG MATRIX-R9290X-P-4GD5. I am looking at this card and I wanted to see if anyone would know if these cards will work together in Crossfire?

Accepted Answer

Sorry for talking so long to replay.  I had to investigate into it a little.  What I have found so far with people crossfire in or sli they have basically the same specs as the previous card. Size,clock speed, ram type, port type, etc.  If you have two completely different cards then you run into know how to took each card to they run withing the same peramitors.  I have one of there card and it gas run what ever program I threw at it with the the fans never hitting above 40% usage so far.  Hopefully this info helps

Question 3

Is this card compatible with PCIE 2.0 slot?

Accepted Answer

It should be, but I don't know why you'd want to spend this much money for a graphics card you can't fully utilize. It would work, but not as fast as PCIe 3.0.

Question 4

So... currently have a Sabertooth 990FX R2.0 with a Radeon HD7850 in it, and I'm thinking it's time for a new card. Looking at getting a Radeon R9 390X.

Problem is - looking at the length and height that might be needed for the 390X, I'm concerned I won't be able to seat the new card (the 390X) all the way because my current card, the HD7850, is touching the top of the SATA ports. The HD7850 (from Asus btw) is a little bit thinner in the back at the coils/fan enclosure compared to the 390X, which appears to maintain card width for its entire length.

I'm worried I'm gonna go out, but the 390X, and not be able to get it to seat all the way in the mobo's PCI Express slot because the card will be too long, and the SATA height will be the blocker.

Any tips on how to determine if the 390X will fit?

Thanks in advance!

Accepted Answer

Fits fine, have same motherboard and had no issues seating in any ports except very bottom port. Clears USB 3.0 case cable. Does not clear Asus Q connector module for bottom most port. My case came close to the card where HDDrive bays are, have Thermaltake v51.

Question 5

Could anyone recommend good fan curve settings for this card to alleviate the heat issues everyone complains about? I've been messing with the fan curve and it seems like a lot of work if someone already has it pretty well figured out.

Accepted Answer

BLUF:  20C - 25%, 40C - 45%, 60C - 60%, 65C - 75%

I've had this card for a bit now.  The default settings run it very hot, more than I am (and I think most) are comfortable.  I think this is a fumble on the marketing - this is not a silent card, though it tries to be.  The fans run quietly up to 40-50% (by quiet I mean no louder than case fans).  I set mine to run at 25% at a minimum, and 45% once the temp rises just beyond its normal levels (for me this is once it passes 40C).  It stays in this zone for most gaming.  Beyond 70% the fan sounds like a jet engine, so I keep it below that, but I've found that 60% tends to cool it pretty quickly if it breaches my comfort zone of 60C, but I have it set to go to 75% if it gets to 65.  This serves as emergency cooling and alerts me that it's getting very hot.  This hasn't happened recently though.

I've also added liquid cooling for my cpu and a new case fan to funnel fresh air directly to the vid card, which reduced the temps significantly, and I set it to run at default speed instead of overclocking for games, the marginal performance gain comes with a disproportionate temperate increase.  Now, it stays in the 50s for me.

Question 6

Does this card come equipped with hdmi 2.0 port and is it hdcp 2.2 compliant? Does this card also support uefi gop bios to initialize windows 8.1 fast boot option? I can't seem to find this information anywhere. Thanks guys.

Accepted Answer

Yes - It provides full support for DisplayPort to HDMI® 2.0 connections via certified dongles but the HDMI port that comes built in does not support HDMI® 2.0

Make sure you download the Crimson Edition Display Driver version 15.30.1025.1001 or newer for DisplayPort to HDMI® 2.0 support

And I am not sure about the "uefi gop bios to initialize windows 8.1 fast boot option" I assume it would. I use Windows 10 and my pc cold starts to the desktop in under 9 seconds, don't know if that answers your question

Question 7

Anyone punch up the clocks to jump the light speed? How 'bout the volts? Rumor has it 390 & 390X are unstable @ high clocks. I rather hear it from actual users.

Accepted Answer

they run hot as hell as is. OCing them doesnt help as they throttle very quickly

Question 8

What is the power demand of the card? what are the minimum pc specs required for the card ?[minimum amount of ram and the point at witch you notice hindered performance caused by your CPU, etc]  These werent even listed on ASUS's website...

Accepted Answer

I'm interested in buying this card, too. They say it requires less watts than the R9 290 (750w) because of it's new memory configuration. But it still uses the same gpu (Hawaii) design. A few years ago, I nearly lost my computer to a psu with lesser power needed for my video card (HD 4950). It black screened on higher graphics.

Question 9

How big of PSU should I run if i wanna crossfire two of these cards?

Accepted Answer

I don't have it set up yet, but I would suggest a solid 1000W PSU. I plan on doing two of these Crossfired in the future, and that's what I plan on getting. I've tried out several PSU wattage calculators with my CPU, fans, and several USB items (not the maximum, just to be practical in the future) and I've gotten results ranging from 808 to 886, depending on the calculator. I tend to err on the side of caution when it comes to PSUs, so I'm just going to bump it up to 1000W. Besides, PSUs really aren't' that expensive (relatively speaking), so the price difference between a 900W and a 1000W isn't a whole lot.

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