Wow. :/
Bet it looks damn nice though.
Bet it looks damn nice though.
Hardware Discussion Thread
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02-07-2015, 09:49 PM
Btw I was reading the GTX 9xx has gpu usage and performance issues with recent Nvidia drivers. I'm wondering if you could get better performance but that issue is holding you back. So is the 3.5GB Vram "issue" working as intended by Nvidia?
02-07-2015, 11:13 PM
^ Which are you referring to, the performance and usage issues with Nvidia drivers or the 3.5GB Vram or both?
02-07-2015, 11:22 PM
3.5GB VRAM. If you go over it there is no 2nd L2 cache to manage it causing a slowdown. It's not a noticible a most non GTX 970 users are saying.
02-08-2015, 12:06 AM
The card decided to stay at maximum boost clock now, it didn't do that yesterday but it has been doing it the whole time today.
Looks like something related to the Power limit, but I don't know what exactly happened yesterday. Anyways, with the Core clock stuck at 1516mhz, here's a new result: http://www.3dmark.com/fs/4006138 02-08-2015, 02:35 AM
Dammit, you have the exact same rig as me except for my GTX680. Now I want to upgrade because of you. q:
>mfw I have no face
02-09-2015, 12:39 PM
DatKid20 Wrote:It's not a "bug" it's due to the GTX 970 having less L2 cache. DatKid20 Wrote:If you go over it there is no 2nd L2 cache to manage it causing a slowdown. The primary reason for the slowdown is that the memory is segmented. Causing the last 512MB to run at 1/7 of the normal memory bandwidth. Not because of any issues with the L2 cache. The last 512MB is cached by the L2. MC 7 and 8 both use L2 block 7 just not at the same time since they're assigned to different segments. In segment 1 it uses the same 256KB cache per 512MB of memory address mapping as segment 0. Read anandtech's article on the subject for more details. Nvidia's drivers are probably pretty good about only putting data that isn't accessed very frequently into that last 512MB so the performance hit is acceptable (5-15%) in the few scenarios where games can actually use that much memory (a few high end games running at maxed out settings at 4K resolution where they achieve pitiful framerates either way). The memory segmentation was done to allow one of the ROP partitions to be partially disabled. It's a very good optimization to the architecture considering the alternative is disabling a full ROP partition with unsegmented memory (which would be much slower in every scenario). This lowers the L2 from 2MB to 1.75MB, ROP count from 64 to 56, and the effective memory buswidth from 256 bit to 224 bit in the case of segment 0 (the first 3.5GB) being used and 256 bit to 32 bit in the case of segment 1 (the last 512MB) being used. I should also point out that the GTX 650 TI boost, GTX 660, and some GTX 660 TI models had a similar "issue" and nobody cared because the performance was excellent for the cost. The only reason this is controversial at all is because the marketing team didn't know about the new feature and therefore didn't list the specs correctly as a result.
"Normally if given a choice between doing something and nothing, I’d choose to do nothing. But I would do something if it helps someone else do nothing. I’d work all night if it meant nothing got done."
-Ron Swanson "I shall be a good politician, even if it kills me. Or if it kills anyone else for that matter. " -Mark Antony 02-09-2015, 03:48 PM
(This post was last modified: 02-09-2015, 03:55 PM by NaturalViolence.)
You have to actually READ THE ARTICLE to learn how something works. Or at the very least consider the technically plausibility of your assertion based on what you've seen in other GPU microarchitectures. When I was first writing my response I didn't know what the "issue" was with the 970 other than that it had something to do with the last 512MB of the vram being slow. But I knew that what you had written had to be wrong because it made no sense. Even though I did not yet know what the correct answer was at the time.
Ego Inflating Lecture: Xtreme2damax Wrote:Will it run Hyrule Field full speed without the speedhack finally? Tongue Doesn't haswell already do that? Xtreme2damax Wrote:Bonus points if it can handle Hyrule Field full speed with efb to ram and lle audio. Looks like I know what I'll be putting some money aside for besides a GTX 960 or 970. It probably will. Haswell should be pretty close to doing that already. For the graphics card I would save your money and wait for the 20nm die shrink coming (hopefully) later this year. For the cpu definitely skip broadwell and wait for skylake. From the roadmap it looks like Intel is planning to use broadwell for lower power devices and come up with a new bigger/faster core (skylake) for larger platforms that can cope with the extra size and tdp. Like the good old days before they started focused on using the same microarchitecture for everything. Seriously don't buy anything until the fall. Anyone who buys new chips in the spring/summer is going to be kicking themselves come fall. Xtreme2damax Wrote:So is the 3.5GB Vram "issue" working as intended by Nvidia? Yes and no. The slow speed of memory segment 1 (the last 512MB of vram) is part of the physical design. That's intended. However there are some games where the drivers memory heuristics don't appear to be working correctly (they're supposed to move the least accessed data into segment 1) resulting in an unnecessary performance drop or block access to segment 1 entirely (resulting in only 3.5GB of vram usable). They're working on it. If these driver issues had not happened I doubt anyone would have ever discovered the "issue" in the physical design. Since the drivers would have continued making the performance effects almost unmeasurable. Which shows you just how irrelevant it is.
"Normally if given a choice between doing something and nothing, I’d choose to do nothing. But I would do something if it helps someone else do nothing. I’d work all night if it meant nothing got done."
-Ron Swanson "I shall be a good politician, even if it kills me. Or if it kills anyone else for that matter. " -Mark Antony |
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