请教各电脑高手!我电脑是联想y550，win7系统，4G内存，为什么在电脑属性里却显示2.99可用，才刚买的啊
推荐回答（5个）
你用的是32位的操作系统。32位的系统理论最多只能使用4G，但是要扣除其他硬件占用的，所以上面显示识别是4G 居微软说win7最多实际能使用到3.4G左右。要是想使用更多的内存，只能使用64位的操作系统
The 32 or 64 bit architecture refers to the memory address length that can be referenced by the processor. This also has an impact on the maximum amount of memory that can be utilised, which is 4GB for a 32 bit CPU (but in reality the maximum accessible ram is closer to 3.4 GB due to other hardware allocations).
http://www.w7forums.com/windows-7-64-bit-vs-32-bit-t484.html
您好。
很抱歉，我们目前主要负责的是联想android平台智能手机以及平板业务咨询，对PC电脑相关问题并不熟悉，请您谅解。
这里建议您通过以下方式获得帮助：
1. 您可以拨打联想PC电脑客服热线进行咨询，联系方式查询：http://support1.lenovo.com.cn/lenovo/wsi/contact.html
2. 您可以访问联想问吧（http://ask.lenovo.com.cn），与官方人员及其他用户进行讨论互动；
3. 您可以通过微信平台与联想客服在线进行咨询，微信号：联想服务，具体可参考：http://support1.lenovo.com.cn/lenovo/wsi/weixin.html?intcmp=lxwm
以上，请您参考记录，谢谢。
祝您生活愉快！
32位系统只能识别3-3.25G内存，多余的识别不出。
要么装64位系统，要么下载虚拟软件把不能识别的内存虚拟成硬盘使用！
2.99可用，就是说还有1G已经在使用中了啊。
你运行系统什么的都要占用内存啊。
正常啊。
因为你的电脑后台（杀毒软件啊。联网啊）占用了一部分内存啊。
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