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Athlon X4 845 (Carrizo) - Page 6

post #51 of 83
Interesting Tidbit I caught on the 845 Specs - Seems it only has 8x PCIe 3.0 video lanes. Doesn't seem to be a problem now but could be depending on Resolutions and such (4k is really going to stress it) with any kind of dedicated card.

One performance review I caught indicated that a Triple A title was already pushing so much across the PCIE lanes that 8x bottle necks it. Can't even find it in my history and Google's damn near useless unless I can remember what terms I used. In all seriousness, it looks good on paper but due to the motherboard support issue (how long has the damn thing been in the wharehouse?) we've been forced to either get a cheap FM2 to at least boot and upgrade or simply bite the cost and go with an A8-7600 as the board maker indicates supported from Initial Bios unlike Carrizo which is only from P2.0 released in Feb (AsRock).

My Nephew isn't an overclocker so that's not an issue but limits on the PCIE could be quite quickly as he plays GW2/SToL heavily.
post #52 of 83
Quote:
Originally Posted by fastturtle View Post

Interesting Tidbit I caught on the 845 Specs - Seems it only has 8x PCIe 3.0 video lanes. Doesn't seem to be a problem now but could be depending on Resolutions and such (4k is really going to stress it) with any kind of dedicated card.
No one who's planning on running 4K should be shopping for an Athlon 845...
     
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post #53 of 83
My friend do some benchmarking and X4 845 is a bit slower compared to X4 860K * in games.
He use GPU AMD 7970
Stock speed X4 845 loosing to X4 860k 2,8% FPS in games
X4 845 @ 4,1Ghz 1,55V loosing to X4 860k @4,5 9,4% FPS in games
Highest loses have in Grid:Autosport
Edited by Rabit - 4/21/16 at 7:52am
Cheap VR bulid :)
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Cheap VR bulid :)
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post #54 of 83
Any losses would likely be due to PCI-e link performance. Half-sized L2 could play a role as well. My own testing (http://excavator.looncraz.net/) doesn't show a single game with reduced performance - but I did test with a 7870XT, which is not sensitive to PCI-e bandwidth (it can run at PCI-e 4x without any loss of performance - at all).
post #55 of 83
Quote:
Originally Posted by looncraz View Post

Any losses would likely be due to PCI-e link performance. Half-sized L2 could play a role as well. My own testing (http://excavator.looncraz.net/) doesn't show a single game with reduced performance - but I did test with a 7870XT, which is not sensitive to PCI-e bandwidth (it can run at PCI-e 4x without any loss of performance - at all).

It makes very little difference as Techpowerup found out in their review: https://www.techpowerup.com/reviews/NVIDIA/GTX_980_PCI-Express_Scaling/21.html
The performance loss is only 1% between 3.0x16 vs 3.0x8, interestingly 3.0x8 was a bit faster than 2.0x16 despite identical bandwidth.
post #56 of 83
Quote:
Originally Posted by InfamousTR View Post

It makes very little difference as Techpowerup found out in their review: https://www.techpowerup.com/reviews/NVIDIA/GTX_980_PCI-Express_Scaling/21.html
The performance loss is only 1% between 3.0x16 vs 3.0x8, interestingly 3.0x8 was a bit faster than 2.0x16 despite identical bandwidth.

I've seen some problems from insufficient PCI-e bandwidth before with a GTX 970. Of course, it was running at PCI-e x1 1.1...

Depending on the motherboard used and the slot used, it's conceivable that the video card in that system may be running at a low enough PCI-e bandwidth to cause some performance problems. The CPU itself is rather capable. The relative lack of L2 being its only other detrimental aspect.
post #57 of 83
Quote:
Originally Posted by looncraz View Post

I've seen some problems from insufficient PCI-e bandwidth before with a GTX 970. Of course, it was running at PCI-e x1 1.1...

Depending on the motherboard used and the slot used, it's conceivable that the video card in that system may be running at a low enough PCI-e bandwidth to cause some performance problems. The CPU itself is rather capable. The relative lack of L2 being its only other detrimental aspect.

I agree, though most people will use a relatively moderate GPU and install it in the primary pci-e slot. The reduced amount of L2 cache is very likely hurting gaming performance, considering that complete lack of L3 cache in the A10-5800K has a negative impact on many games vs the FX-4300. Both have the same architecture and clock speeds so the results are comparable.
post #58 of 83
Quote:
Originally Posted by dlee7283 View Post

I was going to pair the 845 with a Geforce GTX 950 since I have a 4k HDMI 2.0 TV now.

Even the highest end APU's from AMD seem to struggle with fairly optimized games at 720p so I decided to give up on the APU thing. I built a 7700k rig for my friend and he is itching to upgrade after a year because of newer games not running well on it at all. I would get him a Radeon 240/250 but it seems like a waste considering you can just get a more superior dedicated card for like 30 bucks more.

Even though the 845 is weaker I am not trying to push anything extreme gaming wise. I just want some IPC improvements and I like a 65w envelope.

70 for 845
plus
130 for 950

200 bucks for a solid mid range CPU-GPU solution. Radeon APU Crossfire solution is more and performs worse.

Still an AMD lover but it is what it is....

Question for you - since I'm assembling a very similar build to yours.

MSI A78M-E35
Athlon 845
GTX 950 2GD5 OCV1
G.SKILL 2x4GB @ 1600
EVGA SuperNOVA 650 G2

My first time powering up, all case fans / CPU fan / optical / HDD come alive as they should, but I cannot get video output to save my life.

I've been searching a ton of troubleshooting FAQs, and I've ensured the 950 is properly seated and 6-pin connected, tried each stick of RAM in a single slot (4 configurations), ensured mobo power headers (4-pin and 20-pin) properly connected, ensured USB wake jumpers are off, powered off and cleared CMOS jumper (also removed battery), etc. I've even tried 3 different monitors connected via DVI or HDMI.

Just wondering if you encountered any issues like this - and if you did, were you able to get this setup working?

Thanks =)
post #59 of 83
Thread Starter 
Quote:
Originally Posted by mikemarsh76 View Post

Question for you - since I'm assembling a very similar build to yours.

MSI A78M-E35
Athlon 845
GTX 950 2GD5 OCV1
G.SKILL 2x4GB @ 1600
EVGA SuperNOVA 650 G2

My first time powering up, all case fans / CPU fan / optical / HDD come alive as they should, but I cannot get video output to save my life.

I've been searching a ton of troubleshooting FAQs, and I've ensured the 950 is properly seated and 6-pin connected, tried each stick of RAM in a single slot (4 configurations), ensured mobo power headers (4-pin and 20-pin) properly connected, ensured USB wake jumpers are off, powered off and cleared CMOS jumper (also removed battery), etc. I've even tried 3 different monitors connected via DVI or HDMI.

Just wondering if you encountered any issues like this - and if you did, were you able to get this setup working?

Thanks =)

Did you update the bios first. Some motherboards don't support carrizo out of the box
    
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post #60 of 83
Quote:
Originally Posted by dlee7283 View Post

Did you update the bios first. Some motherboards don't support carrizo out of the box

I think you're absolutely right - MSI website does not show Carrizo compatibility for MSI A78M-E35, but does with the MSI A78M-E35 V2 (updated BIOS) version.

Thinking back to mobo selection, I had originally decided to use an 860k for my build, so either mobo version was fine. Switching to 845 obviously negated that conclusion.

I'll start researching options to update BIOS without a monitor. Would definitely prefer not pulling the board if I don't have to.

THANK YOU dlee7283
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