Personal computing discussed

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by AMM
Sat Mar 31, 2018 6:41 am
Forum: Processors
Topic: 6/6 core can't handle "Very Slow" Preset & a Capture
Replies: 16
Views: 5518

Re: 6/6 core can't handle "Very Slow" Preset & a Capture

What bitrate are you targeting? That is going to make a big difference as to whether the very slow setting is going to make a difference in visual quality.
by AMM
Tue Feb 06, 2018 11:32 am
Forum: Graphics
Topic: Program to test/define "video quality"?
Replies: 2
Views: 2378

Re: Program to test/define "video quality"?

When I worked in video conferencing we would use various measures to define video quality. You could use a metric such as PSNR , or MSE . But often the goal is to improve or maintain quality while also reducing bandwidth. In which case you would probably want to use a metric such as the Bjontegaard ...
by AMM
Sun Mar 24, 2013 3:27 pm
Forum: The Back Porch
Topic: Probably the stupidist idea I have ever seen...
Replies: 12
Views: 2916

Re: Probably the stupidist idea I have ever seen...

The really shocking thing is how much you USAians pay for mobile phones.
by AMM
Sat Mar 02, 2013 11:10 am
Forum: The Back Porch
Topic: More fun with fractals...
Replies: 22
Views: 4338

Re: More fun with fractals...

It should be highly parallelizable right? Is your current implementation threaded?
by AMM
Tue Feb 26, 2013 11:40 am
Forum: System Builders Anonymous
Topic: Upgrading a 2007 Build
Replies: 8
Views: 2104

Re: Upgrading a 2007 Build

Well it's all up and running, and with a stable (as of about 3 hours of Prime95 testing) overclock to 4.5Ghz.

I cannot quite comprehend just how quickly this thing can boot now.
by AMM
Mon Feb 25, 2013 8:39 am
Forum: System Builders Anonymous
Topic: Upgrading a 2007 Build
Replies: 8
Views: 2104

Re: Upgrading a 2007 Build

So in the end I went with the 3570K, 16 Gb (2x8Gb) of Corsair Low Profile CL9 1600MHz, the Asus P8Z77-V, a Samsung 250GB 840 Series SSD, and a Coolermaster Hyper 212.

They should arrive tomorrow, I will report back how the build goes!
by AMM
Thu Feb 21, 2013 6:18 am
Forum: The Back Porch
Topic: Thresholds
Replies: 12
Views: 2548

Re: Thresholds

This isn't to do with the machines not being cleaned. This is to do with unscrupulous suppliers across the EU labelling horsemeat as beef in order to turn a quick profit.

http://www.bbc.co.uk/news/uk-21335872
by AMM
Thu Feb 21, 2013 6:03 am
Forum: The Back Porch
Topic: More fun with fractals...
Replies: 22
Views: 4338

Re: More fun with fractals...

Any chance of github-ing your code?
by AMM
Sun Feb 17, 2013 2:10 pm
Forum: System Builders Anonymous
Topic: Upgrading a 2007 Build
Replies: 8
Views: 2104

Re: Upgrading a 2007 Build

I'd be inclined to overclock if I got the unlocked CPU, so what would be my best bet for CPU cooler? I'd prefer to stick to just air, and noise isn't much of a concern.
by AMM
Sun Feb 17, 2013 8:27 am
Forum: System Builders Anonymous
Topic: Upgrading a 2007 Build
Replies: 8
Views: 2104

Upgrading a 2007 Build

So I think it's finally time I take the plunge and replace the motherboard and processor combo that I've had since 2007. The core of the system is a socket 775 Kentsfield Core 2 Quad Q6600 sitting in an Abit IP35 Pro motherboard. Now since the initial build I've upgraded from 2Gb to 4Gb of ram, and ...
by AMM
Thu Mar 01, 2012 2:02 pm
Forum: Windows
Topic: Can't Even Edit a Little .CFG File--WTF, Man!?
Replies: 17
Views: 3580

Re: Can't Even Edit a Little .CFG File--WTF, Man!?

Just open notepad as an administrator. Right click on notepad and select "Run as Administrator", then you will be able to open and edit your file.
by AMM
Wed Dec 14, 2011 2:35 pm
Forum: The Back Porch
Topic: Holographic displays
Replies: 11
Views: 2645

Re: Holographic displays

What is the light projected off of? Do you have any links or information about the actual mechanics or physics involved in these displays?
by AMM
Fri Jul 29, 2011 6:58 am
Forum: The Back Porch
Topic: Relativity of simultaneity question.
Replies: 20
Views: 4691

Re: Relativity of simultaneity question.

crissy wrote:
This may be the wrong place to post about this issue, but oh well, I can't find an e-mail address for the site administrator.


Really, yes it is.
by AMM
Mon May 23, 2011 7:20 am
Forum: System Builders Anonymous
Topic: Upgrade options from a 8800 GTS
Replies: 25
Views: 4305

Re: Upgrade options from a 8800 GTS

I've just flashed the 6970 bios onto the 6950 and it seems to have worked perfectly.

Thanks again for the great advice!
by AMM
Sat May 21, 2011 8:52 am
Forum: System Builders Anonymous
Topic: Upgrade options from a 8800 GTS
Replies: 25
Views: 4305

Re: Upgrade options from a 8800 GTS

Just a quick update for the kind folks who helped me out. My replacement bios arrived and has been installed succesfully along with my HD 6950. I am currently just testing a gentle overclock to around 2.8Ghz. If this looks okay I will gradually nudge higher until I get scared! Thanks again for all t...
by AMM
Fri May 20, 2011 5:42 am
Forum: System Builders Anonymous
Topic: Upgrade options from a 8800 GTS
Replies: 25
Views: 4305

Re: Upgrade options from a 8800 GTS

Yep. The bios I have has a bootblock recovery feature, and can be used to reflash the bios if you have a working floppy drive. Unfortunately I haven't had a floppy drive since around '07. I figured it would be easier and quicker to use a bios replacement service than to go and buy a floppy drive and...
by AMM
Fri May 20, 2011 4:01 am
Forum: System Builders Anonymous
Topic: Upgrade options from a 8800 GTS
Replies: 25
Views: 4305

Re: Upgrade options from a 8800 GTS

The bios EEPROM is dead. But I have ordered a replacement, so if that works I plan to keep the motherboard, CPU and RAM for a bit longer. If that doesn't fix it, then I guess I will have to bite the bullet and upgrade to Sandy Bridge... (ah well :P).
by AMM
Thu May 19, 2011 2:10 pm
Forum: System Builders Anonymous
Topic: Upgrade options from a 8800 GTS
Replies: 25
Views: 4305

Re: Upgrade options from a 8800 GTS

Well I ordered a 2Gb 6950. I tried to play around with overclocking today, and got it into my head to try and update the motherboard BIOS (not sure why I thought I needed that), and managed to fry it. Am now also waiting on a replacement BIOS. Oh well.
by AMM
Wed May 18, 2011 9:10 am
Forum: System Builders Anonymous
Topic: Upgrade options from a 8800 GTS
Replies: 25
Views: 4305

Re: Upgrade options from a 8800 GTS

I'm at work so can't go poking around inside the case. I seem to recall I have a fairly decent 750W Antec power supply, and I think I may even have a CoolerMaster cpu cooler. But I will double check those components when I get the chance!
by AMM
Wed May 18, 2011 6:37 am
Forum: System Builders Anonymous
Topic: Upgrade options from a 8800 GTS
Replies: 25
Views: 4305

Re: Upgrade options from a 8800 GTS

Jigar wrote:
Have you ever thought of OCing your CPU, you are definitely CPU bottleneck at 2.4GHZ with new games. I am having the same CPU currently @ 3.4GHZ.


I will look into it!
by AMM
Wed May 18, 2011 5:24 am
Forum: System Builders Anonymous
Topic: Upgrade options from a 8800 GTS
Replies: 25
Views: 4305

Re: Upgrade options from a 8800 GTS

Thanks for the quick reply. I have no particular loyalty to any manufacturer. I'll buy the best bang for my buck at any given time. The Radeon HD 6950 seems like a good upgrade especially if it is essentially a 6970. What would be the major difference between the 1GB and 2GB version, will I notice a...
by AMM
Wed May 18, 2011 4:45 am
Forum: System Builders Anonymous
Topic: Upgrade options from a 8800 GTS
Replies: 25
Views: 4305

Upgrade options from a 8800 GTS

Dear Gerbils, I would like to upgrade my GPU in the following system. I use this PC for gaming, mainly RPG's (Dragon Age 1/2, Witcher, Oblivion) and FPS (Borderlands, Portal 2, Half Life 2 series) etc. It has so far handled most things I have thrown at it, but it is starting to get a bit long in the...
by AMM
Thu Dec 16, 2010 1:13 pm
Forum: Linux, Unix, and Assorted Madness
Topic: Backdoor in OpenBSD IPSEC stack
Replies: 8
Views: 2893

Re: Backdoor in OpenBSD IPSEC stack

Interesting. I never said, nor implied, that closed source could not have such a flaw. Albeit with closed source software the scope of such a flaw would be more egregious as that would mean the private company was complicit in the implementation of said back door. How is paying off a private (or pu...
by AMM
Thu Dec 16, 2010 5:46 am
Forum: Developer's Den
Topic: password salting
Replies: 15
Views: 5578

Re: password salting

You should at the very least have the database server set up with firewall rules to disallow connections except from certain whitelisted IP addresses, i.e. your game server. For testing purposes you would be better off having separate staging servers that aren't publicly accessible. With what we've ...
by AMM
Wed Dec 15, 2010 11:13 am
Forum: Developer's Den
Topic: password salting
Replies: 15
Views: 5578

Re: password salting

http://chargen.matasano.com/chargen/2007/9/7/enough-with-the-rainbow-tables-what-you-need-to-know-about-s.html Here is an interesting article to read. I think the general lesson to take away from all of this is "Do not design your own crypto-systems unless you are a security expert". Crypt...
by AMM
Wed Dec 15, 2010 11:00 am
Forum: Developer's Den
Topic: password salting
Replies: 15
Views: 5578

Re: password salting

One MD5s biggest problems is the fact that two completely different passwords can potentially generate the same exact hash. To account for this, you salt the password with some other fields further lessening the likelihood. Some salts can be a combination of fields for the same user such as the Id ...
by AMM
Wed Dec 15, 2010 8:38 am
Forum: Developer's Den
Topic: password salting
Replies: 15
Views: 5578

Re: password salting

BTW my suggestion was NOT to store the salt in the database, but rather to calculate the salt using an algorithm. This would force the hacker to try every possible salt. But you can't assume your algorithm is going to be secure. If they have access to your database, then they may well have access t...
by AMM
Wed Dec 15, 2010 8:36 am
Forum: Developer's Den
Topic: Math question...
Replies: 26
Views: 6849

Re: Math question...

<A> XOR <A> is not a hash function either, since (as you've pointed out) it always results in zero. <A> XOR <C> (where C is a known constant) preserves information. As another interesting example, consider the swapping of two variables without the use of a temporary -- the following sequence will s...
by AMM
Wed Dec 15, 2010 7:40 am
Forum: Developer's Den
Topic: password salting
Replies: 15
Views: 5578

Re: password salting

http://codahale.com/how-to-safely-store-a-password/ Don't assume your algorithm is going to be secret, or your salts will be (if they are per user they will have to be stored in the database anyway), if an attacker has access to your database, they may well have access to everything else. Basically ...
by AMM
Mon Sep 06, 2010 8:21 am
Forum: The Back Porch
Topic: Can EMR be blocked, and what does it take?
Replies: 10
Views: 1789

Re: Can EMR be blocked, and what does it take?

An ideal Faraday cage will block electromagnetic radiation, but most enclosures are not ideal Faraday cages. In the case of your flashlight, you are correct that it will give off a lot of energy, however depending on how efficient the bulb is, it will be giving off most of that energy in two differe...
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