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***official amd 83x0 overclocking thread***

teppic said:
Anyone after a board upgrade - there are two Crosshair V Formula boards b-grade for £100 at the moment.
Click to expand...

Great price.

I really like this M5A97 tbh. The box is tiny and you literally get a board and that's it, but for £60? it's lovely. Nice big heatsinks too.
 
ALXAndy said:
Great price.

I really like this M5A97 tbh. The box is tiny and you literally get a board and that's it, but for £60? it's lovely. Nice big heatsinks too.
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If these Never Settle bundles come to the 8320 it'd make an excellent budget pairing with a reasonable £25 cooler.
 
alex_123_fra said:
So here is the 7990 I received today guys:



Very well built card and a lovely backplate. Here are some pics in the rig. This isn't a thing of beauty and the colour coordination was mainly determined by what fans I had left :).




Here is the first 3DMark 11 run at only 4.6 GHz on the 8320 and the 7990 at bone stock. Pretty nice GPU score I think at over 18000. The CPU was being utilised at 100% at points in this so need to repeat this with it OCed to 5GHz + and check some results. The card is effortless. I haven't read up on how to overclock it or whether there are any custom bioses, but thermally, not an issue. Less than 57 C top temps at load. There is coil whine, but not annoying and they all do it.


When I get a chance, I will OC both the CPU and the GPU and also do some game benches.
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looks great alex solid rig there now :D
 
Some more results from a bit more light benching. I think I am reaching the limits of this PSU when the 7990 and 8320 are both overclocked so will need to get a new one to really overclock.

So far:

Stock 7990 and FX 8320 @ 5GHz


7990 at 1100Mhz core and 1575 MHz mem. These are the max standard OC settings achievable at stock volts of 1.2V. GPU score of 20,663! She has plenty more to give if you extend the overclocking limits on MSI AB but see below re: PSU.


Firestrike score at 5GHz and 7990 at 1100 core and 1575 mem:


When I try to overclock the 7990 any further or increase voltage above 1.25V I am getting random powerdowns so I know this PSU isn't man enough. I think I will need a good 850W one to properly give it a go. Max temps on the 7990 at 1100core and 1575 mem are 64 C or so.
 
alex_123_fra said:
Some more results from a bit more light benching.
/snip
I think I will need a good 850W one to properly give it a go.
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Thanks alex. So is it true then the FX bottlenecks the GPU, have you managed to test on a couple of games?

alex_123_fra said:
As my PSU is so weedy, I just bought this:

http://www.overclockers.co.uk/showproduct.php?prodid=CA-015-SS&groupid=701&catid=123&subcat=2383

Will try OCing the CPU and GPU on this to see if we get some improvements under load.
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Very nice PSU!
 
Hi Thont, thanks. I haven't seen any evidence of bottlenecking in benchmarks yet except if the CPU is at totally stock speeds. When I install the new PSU I will be able to overclock the 7990 and CPU better (at the same time) and will show some results.

This is an interesting link. It shows the difference in 3DMark 11 between my score with CPU at 4.6 GHz and 5 GHz. GPU scores about the same in both runs. The 5 GHz bump nets around 1-2 fps improvement even in combined score, so no bottleneck there. This is all with the 7990 at stock speeds:

http://www.3dmark.com/compare/3dm11/7396889/3dm11/7396936

I will need to repeat this testing with the 7990 overclocked and the CPU at higher than 5 GHz. I will also test on the extreme setting.

I haven't tested any games yet but I will try some game benches like batman to see the sorts of frame rates I get. It is tough to bench games as you need a fairly reproducible run (unless the game has a built in bench).

I will also buy BF4 to see how the system performs.

Looking at the 7990 GPU score at 1100 core and 1575 memory (a modest overclock and) it stacks up nicely against other setups you see in the 3DMark 11 thread. Beats many GTX690s and also 7970 crossfire setups and this is without extending the overclocking limits on afterburner yet. It is a very impressive card.
 
You're not going to see a bottleneck in a synthetic like 3D Mark 11.
You can get pentiums maxing out a single Titan in Heaven, but that's a huge bottleneck in gaming.

BF4 would only bottleneck in set circumstances ; 64 man servers etc (Which happens now in BF3, Intel included)

Is that 5GHZ fully stable you've got there? Seems like the silicon is really up there right now.

What do you find unstable about Windows 8? It's been the most stable and fast OS I've ever used (As is the same experience most people seem to experience)

Batman Arkham Origins at 8x MSAA at 1080p fully maxed out on a single 7970 it's pretty unplayable anyways, so you'd probably get the same results with CPU's from the last 6 years. With a 7990 maxed out 1080p at 8x MSAA, you're likely again to not see a bottleneck.
 
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Martini1991 said:
You're not going to see a bottleneck in a synthetic like 3D Mark 11.
You can get pentiums maxing out a single Titan in Heaven, but that's a huge bottleneck in gaming.

BF4 would only bottleneck in set circumstances ; 64 man servers etc (Which happens now in BF3, Intel included)

Is that 5GHZ fully stable you've got there? Seems like the silicon is really up there right now.

What do you find unstable about Windows 8? It's been the most stable and fast OS I've ever used (As is the same experience most people seem to experience)
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I agree, hence why I want to test either validated game benches or at least get some reproducible runs. GPU/CPU reviewers rarely test 64-man servers etc as the results just aren't reproducible and there are many other variables to consider. Will try though.

My 5GHz clock is fully prime stable. In fact this CPU runs at 5.2/5.3 GHz fully stable but only under win7 ultimate. Win 8 requires a massive increase in voltage which my thermal setup cannot cope with 24/7. I think win8 itself is a fine OS but sadly the bios released by Asus for it on the CHVFZ is broken and unstable and causes random shutdowns. It has been reported to Asus and we are awaiting an updated bios. For the moment, on my specific setup, the most stable system is win7 ultimate 64 with bios 1503.
 
Only problem with some in built game benchmarks is that they tend to not be indicative of the game performance.

I remember loads, Tomb Raider, Rome Total War 2, Just Cause 2, Crysis etc etc.
 
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