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TiPEX 2014 年 5 月 29 日 上午 5:05
Windows only detects 3GB RAM out of 4GB installed.
Hi all,
I recently installed 4GB of RAM (2x2GB), however i have an issue. If i go into system properties, it says i only have 3GB RAM (NOT 4gb (3gb usable)), and the CPU usage is always at 100%. If i take one of the sticks out, it works fine with 2gb.

Any help is appreciated, thanks in advance.

I am running Windows 7 32-bit, so it should support up to 4GB or RAM. My hardware isn't using up 1GB, i checked in resource manager.
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senseidongen 2014 年 5 月 29 日 上午 5:13 
Full specs? Windows usually says something like 3.3GB RAM usable on 32bit machines for reasons I can't remember right now but the point is that that isn't too unusual... CPU stuck at 100%, that is more alarming. Does that persist after reboots and closing all programs?
最后由 senseidongen 编辑于; 2014 年 5 月 29 日 上午 5:47
#1
Astraea Kisaragi 2014 年 5 月 29 日 上午 5:35 
32bit systems can detect only 3,6GB, not 4 as many claim. Also if you have integrated GPU it can also take down some from the memory.
#2
TiPEX 2014 年 5 月 29 日 上午 5:57 
I have heard about the GPU using some memory, but i have read that it would show it in resource manager. That's not the case. And yes, the CPU problem is still there after multiple reboots, even when disabling all non-Microsoft services (read somewhere that that could help). It's perfectly normal if i just have one stick in. Thanks for all the quick reply's :)
#3
PLANTROON 2014 年 5 月 29 日 上午 5:58 
Windows 64 bit detects 4 GB of RAM, but you must have video RAM in mind as well. That also needs to be mapped.. + some caches here and there + something consumed by BIOS ...
That way you get it down to around 3 GB of actual RAM. You should be using 64 bit OS if your CPU supports it. There are very few disadvantages you get by using 64 bit OS.
#4
TiPEX 2014 年 5 月 29 日 上午 6:07 
My CPU is an Intel Pentium D 820, i'm not sure if it supports 64-bit... anyway i can check this to be sure? And wow, wasn't expecting such quick replies. Thanks alot
#5
PLANTROON 2014 年 5 月 29 日 上午 6:19 
引用自 TiPEX360：
My CPU is an Intel Pentium D 820, i'm not sure if it supports 64-bit... anyway i can check this to be sure? And wow, wasn't expecting such quick replies. Thanks alot
Yes it does support 64 bit :)
#6
MrMcSwifty 2014 年 5 月 29 日 上午 6:20 
It does support 64 bit, but I'm not sure it's really even worth upgrading to a 64 bit system just to get that extra .8GB of RAM...
#7
TiPEX 2014 年 5 月 29 日 上午 6:25 
引用自 McSwifty：
It does support 64 bit, but I'm not sure it's really even worth upgrading to a 64 bit system just to get that extra .8GB of RAM...
I'm hoping that if it actually detects all them i have in it, maybe it will fix the high CPU usage problem..?
#8
MrMcSwifty 2014 年 5 月 29 日 上午 6:32 
It will certainly detect the full 4GB, but I'm not sure the extra RAM is what is causing the CPU issue. I run a dual boot 32bit XP/64 bit Win7 system with 8GB of RAM, and the addition RAM doesn't cause any issues with the 32 bit OS, it just doesn't detect the full 8GB. Every system is different though so it's certainly possible.

Out of curiosity, have you tried swapping the two 2GB sticks (as in using one and then the other, one at a time) to determine it's not one of the individual sticks that is bad? A bad RAM module seems more likely to cause inexplicable CPU spikes then simply having "too much" of it.
最后由 MrMcSwifty 编辑于; 2014 年 5 月 29 日 上午 6:33
#9
TiPEX 2014 年 5 月 29 日 上午 6:45 
McSwifty, yes i have tried swapping them around, with no improvement. Also if i only have one stick, no matter which one it is, then the problem is resolved.

引用自 UberFiend：
Make sure the 2 sticks are in slots 1 & 3 (same colour) not slots 1 & 2, or they won't operate in dual-channel mode which improves speed.

In Start Menu go into Accessories, System Tools & open Resource Manager. Check there what is working the chip so hard.

I only have 2 slots in my motherboard, so i can't do 1&3, only 1&2.
#10
MrMcSwifty 2014 年 5 月 29 日 上午 7:36 
Next silly question... the two sticks came in the same kit, yes? Same manufacturer, same voltage, timings, etc???
#11
TiPEX 2014 年 5 月 29 日 上午 8:45 
yes, they're identical
#12
rotNdude 2014 年 5 月 29 日 上午 9:34 
What is the make and model of motherboard and what is the make and model of the RAM?

http://www.cpuid.com/softwares/cpu-z.html
#13
TiPEX 2014 年 5 月 29 日 上午 10:39 
My motherboard is an Acer ERC410M, and my memory is Kingston DDR2 PC2-4300 266Mhz 16 chip. I'm pretty sure they're compatible as it does work with one stick. I've been wondering if it's a possibility that the motherboard is faulty?
#14
TiPEX 2014 年 5 月 29 日 上午 10:57 
Ok, but if that's holding the CPU back, then how come it works normally with one stick?
#15
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发帖日期： 2014 年 5 月 29 日 上午 5:05
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