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CPU Benchmarks: Clock Speeds And Threading

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2:00 AM - 05/14/2009 by Don Woligroski

Usually, it’s easy to benchmark CPU core and clock speed scaling, but with the 60 FPS limitation, it’s a little more complicated here. If we simply increase and decrease the number of CPU cores, we might see no difference at all if our clock speed is sufficient to keep the frame rate above 60 FPS. Thus, we’ll do the clock speed tests first to make sure we’re running lower than the vsync ceiling. We will disable CPU cores appropriately to make sure that if there are any differences, then they can be seen below the vsync limit.

We’ll run at a low resolution paired with the powerful Radeon HD 4850 video card to ensure that the graphics subsystem won’t interfere with the numbers.

Now that we have a method, let’s see how CPU clock speed affects Burnout Paradise:

We adjusted our clock speeds by lowering the CPU multiplier to keep everything else (such as memory speed) on an even keel. Note that the lowest multiplier available in the BIOS was 6x, which corresponded to the 1.8 GHz clock speed shown in the graph. Even at the dramatically-lowered clock speed, there seems to be little effect on game play. But it’s significant that the average speed is at least below the vsync limit of 60 FPS, which means we’re seeing a meaningful rate of maximum performance for that clock speed, and we are thus able to run our CPU core test.

The CPU core test shows us exactly what our recent How Many CPU Cores Do You Need? article suggests: this game utilizes up to three CPU cores efficiently and the biggest performance jump occurs between single and dual cores.

Talkback
cruiseoveride 05/14/2009 8:50 AM
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IzzyCraft 05/14/2009 9:17 AM
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I like the nvidia shadows more makes it less bland look imo a more definitive look which i like.

I was wonding why no 4870 like above.

SSAO on :) reminds me of ripping dvd's and messing with sharpness, debanding etc the telephone wire atleast.

enterco 05/14/2009 9:20 AM
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Considering how 'hardware friendly' is this game, probably it will be very successful.

SpadeM 05/14/2009 9:22 AM
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UFO_WARVIPER 05/14/2009 9:27 AM
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Nice article so far. I'm still reading the article, but I just wanted to point out that on page 7 of this review, I think the author somehow confused (a couple times) the 4830 with the 4850, and also the GTS 250 with the GTX 260 cards.

Quote :
With the resolution increased to 1920x1200, only the Radeon HD 4830 and GeForce GTS 250 barely pass the playable standard with over 30 FPS minimum frame rates.


Clearly, he meant the other cards here.

IzzyCraft 05/14/2009 10:14 AM
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SpadeM :
The first screen shot comparison is quite tricky on the first look you might think the geforce does not render the red car at all.


A roll over png or jpg would have probably done better then the color restrivie .gif that was used, Shame that IE8 doesn't support APNG like opera and ff does, it would def make the format much more popular.

chyll2 05/14/2009 10:23 AM
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I really like the additional benchmark that imitates different number of cores and clocks. It gives us an idea of performance we would get on similar specs with our system.

linaaslt 05/14/2009 12:28 PM
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Somehow i missed benches from hd4770 or 4870/4890 and gtx275. but maybe it's because this game doesn't require good GPU to be playable.

zehpavora 05/14/2009 1:33 PM
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I think that, if you want to play this game with 8x MSAA, 8x AA, and High settings, a GTX 275 SLI will work. This game must be amazing at those settings! I like Race Games too, but NSF also lost me on Pro Street. I hope Burnout delivers what EA couldn't...

DjEaZy 05/14/2009 1:47 PM
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mottamort 05/14/2009 1:51 PM
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A great and thorough article. Good job Toms :)

mottamort 05/14/2009 1:54 PM
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@ DjEaZy

50~100fps ?
How were you able to get past the 60 ceiling into the 100's?

neiroatopelcc 05/14/2009 2:02 PM
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It's a nice game alright, but it has one drawback that offsets how easy it is to run it. It has no LAN only gaming options, so how little hardware is required becomes irrelevant as you're forced to have internet access to play with your own family.

DjEaZy 05/14/2009 2:03 PM
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cknobman 05/14/2009 3:22 PM
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ATI image quality blows Nvidia away, hands down. (for the record I own a GeForce so no ATI fanboy here)

bill gates is your daddy 05/14/2009 3:24 PM
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DjEaZy :
... tha 100fps iz rear in the hills... just turned v-sync off and turn up tha AMD fusion tool... it's rear, that it drops below 50fps...




That's funny. I guess Don was lying to us when he wrote the following...

"While EA was nice enough to provide us with testing materials, it wasn't able to give us access to the developers to see if there was a way around the vsync limitation for our benchmarks. Regardless, we will benchmark with a 60 frame per second (FPS) limit cap, and this will reflect exactly the kind of experience that you, the user, will have."

erloas 05/14/2009 4:13 PM
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Well the 60Hz V-sync limit is only the limit if that is what your monitor refreshed at. If someone has a good quality CRT still its very possible to have them with refresh rates in the 75-85Hz range. I haven't see any with 100Hz refresh yet. (I happen to be using a 21" CRT still that does 75Hz at 1600x1200. I've got a 26" LCD in the mail though, we'll see how they compare)

bill gates is your daddy 05/14/2009 4:26 PM
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"Up front, we have to say that there is no way to turn off vsync in this game. Forcing vsync off with the Radeon or GeForce drivers had no effect."

"It looks like every card we tested is bumping up against the 60 FPS vsync limit"

"hitting the 60 FPS vsync barrier"

"still hitting the vsync barrier, suggesting it has more to give"

Everyone claiming they reached higher fps rates please post how you did it and show screenshots for proof.

DjEaZy 05/14/2009 4:28 PM
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... maybe a glitch in FRAPS?!...

Geibys 05/14/2009 5:23 PM
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Liked the article but when they do game reviews or tests like this article why don't they use the Nvidia Performance to crank up the settings to 16xQ in the control panel to see if there is a difference, especially with the new Antialiasing SLI mode.


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