I have a cloud server, with:
5120 RAM and 4.6Ghz

My question is: if I add more CPU, (11.5 Ghz) will the load time of the pages be higher?
I mean, is this always gradual? More CPU = faster pageload? And if not, how does it work and how can I learn more about this?

**UPDATE:**
Symcbean's answer was very clear. But there is still something I don't understand (and what I find on Google, more people don't)
I've tried to put it in a metafore:  

Let's say I've got a bucket with water (the bucket with water = the PHP process, with caching etc)
I want to empty the bucket into a funnel. (the end of the funnel = server speed, how bigger the end of the funnel, the faster the water runs through it)  

If I have a funnel-end of 0.5 inch, it goes through slow. If I have one of 1 inch it goes faster.
But if the funnel-end is (let's say) 10 inch, it doesn't matter if I have 10 inch or 20 inch, the water goes through it at the same speed.  

So with this metafore I mean; how do I know I'm using 100% of the capacity and how do I know that I don't need more...?

PS:
I would really appreciate it if somebody could explain, what the max is, and how this actually works or how I can find this out?

PPS:
this is the output when I run 'top'

```
top - 23:06:18 up 54 days,  6:08,  1 user,  load average: 0.51, 0.43, 0.47
Tasks: 107 total,   2 running, 105 sleeping,   0 stopped,   0 zombie
Cpu(s): 28.1%us,  1.5%sy,  0.0%ni, 70.2%id,  0.0%wa,  0.0%hi,  0.0%si,  0.2%st
Mem:   4966748k total,  4493968k used,   472780k free,   241436k buffers
Swap:  4194300k total,   123252k used,  4071048k free,  2836028k cached

  PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+  COMMAND                                                                                                                                       
16432 root      20   0 1115m 283m  30m R   95  5.8   1:11.39 php                                                                                                                                            
16422 www-data  20   0  927m  45m  21m S   18  0.9   0:00.53 apache2                                                                                                                                        
20270 mysql     20   0 2327m 330m 5500 S    7  6.8 474:19.11 mysqld                                                                                                                                         
  617 n2        20   0 14268 1140  488 S    1  0.0 182:58.64 n2txd                                                                                                                                          
30212 root      20   0     0    0    0 S    1  0.0  24:50.48 flush-202:1                                                                                                                                    
26848 root      20   0 99424 1108  856 S    0  0.0   2:47.63 sendmail-mta                                                                                                                                   
    1 root      20   0 24188 1556  872 S    0  0.0   0:09.09 init                                                                                                                                           
    2 root      20   0     0    0    0 S    0  0.0   0:00.00 kthreadd                                                                                                                                       
    3 root      20   0     0    0    0 S    0  0.0   0:48.36 ksoftirqd/0                                                                                                                                    
    4 root      20   0     0    0    0 S    0  0.0   1:27.21 kworker/0:0                                                                                                                                    
    5 root      20   0     0    0    0 S    0  0.0   0:00.05 kworker/u:0                                                                                                                                    
    6 root      RT   0     0    0    0 S    0  0.0   0:00.00 migration/0                                                                                                                                    
    7 root      RT   0     0    0    0 S    0  0.0   0:26.69 watchdog/0                                                                                                                                     
    8 root      RT   0     0    0    0 S    0  0.0  21841:40 migration/1                                                                                                                                    
    9 root      20   0     0    0    0 S    0  0.0   0:00.00 kworker/1:0                                                                                                                                    
   10 root      20   0     0    0    0 S    0  0.0   0:56.84 ksoftirqd/1                                                                                                                                    
   11 root      RT   0     0    0    0 S    0  0.0   0:23.78 watchdog/1                                                                                                                                     
   12 root      RT   0     0    0    0 S    0  0.0   0:00.00 migration/2                                                                                                                                    
   13 root      20   0     0    0    0 S    0  0.0   0:00.00 kworker/2:0                                                                                                                                    
   14 root      20   0     0    0    0 S    0  0.0   0:48.05 ksoftirqd/2                                                                                                                                    
   15 root      RT   0     0    0    0 S    0  0.0   0:19.11 watchdog/2                                                                                                                                     
   16 root      RT   0     0    0    0 S    0  0.0   0:00.00 migration/3                                                                                                                                    
   17 root      20   0     0    0    0 S    0  0.0   0:00.00 kworker/3:0                                                                                                                                    
   18 root      20   0     0    0    0 S    0  0.0   0:40.08 ksoftirqd/3                                                                                                                                    
   19 root      RT   0     0    0    0 S    0  0.0   0:19.24 watchdog/3                                                                                                                                     
   20 root       0 -20     0    0    0 S    0  0.0   0:00.00 cpuset                                                                                                                                         
   21 root       0 -20     0    0    0 S    0  0.0   0:00.00 khelper                                                                                                                                        
   22 root      20   0     0    0    0 S    0  0.0   0:00.00 kdevtmpfs                                                                                                                                      
   23 root       0 -20     0    0    0 S    0  0.0   0:00.00 netns                                                                                                                                          
   24 root      20   0     0    0    0 S    0  0.0   0:00.00 kworker/u:1                                                                                                                                    
   25 root      20   0     0    0    0 S    0  0.0   0:00.00 xenwatch                                                                                                                                       
   26 root      20   0     0    0    0 S    0  0.0   0:00.00 xenbus                                                                                                                                         
   27 root      20   0     0    0    0 S    0  0.0   0:22.29 sync_supers                                                                                                                                    
   28 root      20   0     0    0    0 S    0  0.0   0:00.42 bdi-default                                                                                                                                    
   29 root       0 -20     0    0    0 S    0  0.0   0:00.00 kintegrityd                                                                                                                                    
   30 root       0 -20     0    0    0 S    0  0.0   0:00.00 kblockd                                                                                                                                        
   31 root      20   0     0    0    0 S    0  0.0   1:57.23 kworker/2:1                                                                                                                                    
   32 root       0 -20     0    0    0 S    0  0.0   0:00.00 ata_sff                                                                                                                                        
   33 root      20   0     0    0    0 S    0  0.0   0:00.00 khubd                                                                                                                                          
   34 root       0 -20     0    0    0 S    0  0.0   0:00.00 md                                                                                                                                             
   36 root      20   0     0    0    0 S    0  0.0   0:01.45 khungtaskd                                                                                                                                     
   37 root      20   0     0    0    0 S    0  0.0   0:29.28 kswapd0                                                                                                                                        
   38 root      25   5     0    0    0 S    0  0.0   0:00.00 ksmd                                                                                                                                           
   39 root      20   0     0    0    0 S    0  0.0   0:00.00 fsnotify_mark                                                                                                                                  
   40 root      20   0     0    0    0 S    0  0.0   0:00.00 ecryptfs-kthrea                                                                                                                                
   41 root       0 -20     0    0    0 S    0  0.0   0:00.00 crypto                                                                                                                                         
   49 root       0 -20     0    0    0 S    0  0.0   0:00.00 kthrotld                                                                                                                                          50 root      20   0     0    0    0 S    0  0.0   0:00.00 khvcd                                                                                                                                             51 root      20   0     0    0    0 S    0  0.0   1:19.07 kworker/3:1                                                                                                                                       70 root       0 -20     0    0    0 S    0  0.0   0:00.00 devfreq_wq                                                                                                                                        71 root      20   0     0    0    0 S    0  0.0   1:03.05 kworker/0:1                                                                                                                                      190 root      20   0     0    0    0 S    0  0.0   1:31.64 kworker/1:1                                                                                                                                      193 root      20   0     0    0    0 S    0  0.0   2:52.19 jbd2/xvda1-8        

```